Another newbie, with a concern

Since I am also new with these devices, I would not be an authority, however...
getting "there" requires a fair amount of retraining of mind & body. I wouldn't think not feeling super excited after a session is anything to be concerned about.
You didn't state age, physical condition, etc. Those things come in to play.
But I find a sense of satisfaction that remains for a week or more post session, & I am barely getting started. I still have a lot of retraining to do.
I also think there's a certain amount of beginner's luck happening with early sensations that are not readily reproducible: at least in my case, I got my expectations up a lot after my first few sessions, then have had to trim back my hopes & continue to work on my kegel & other muscle exercises (until this forum I never realized there was any distinction amongst the muscles 'down there's).
I'm sure someone smarter than I will chime in.

I have had the same problem as you in the beginning : My libido whent to zero, I had to "restart it" with masturbation.
It might be a side effect of the starting of the rewiring process maybe ?
Does anyone else experienced the same thing ?
Did you ever had such a drop in sex drive before ? How would you describe your medium libido compared to an "average" person ?
I have had another situation that makes my libido drop like that, I'm going to make another post about it.

You might be making a correlation when there is none.
What is your approximate age? My libido starting dipping around 38 yrs old, of course everyone is different.
I would not worry.

I think I had a p-wave once but can't recreate it. It felt like something was very slowly stroking my prostate from bottom to top. Simply amazing. That's the first part, that I can't seem to recreate

What you are describing is very common for new Aneros users. Initial sensations can be very subtle but as you learn to focus your mind on them they will become more distinct and grow in apparent intensity. One very common impediment for new users is the idea you can create these sensations through force of will, this is an illusion of your ego consciousness, you need to "Just Let Go !" and allow your body to lead here.

... since my last use (about two weeks ago), I have no sex drive whatsoever. I'm not inclined to have sex, watch porn, masturbate...nothing. Anyone have any ideas?

There are many possible reasons for a drop in libido, (diet, drugs, general health, psychological states, endocrine system imbalances, testosterone levels, etc.), I doubt your Aneros use constitutes a causality. I'd suggest you first have a blood test to check your testosterone level and then start looking at other aspects of your life style to see how they may be impacting you.

Is the Aneros supposed to move in and out of you with contractions, or just gently "rock" back and forth? I seemed to have gotten that hang of make it go in and out a ways without it falling out. Not sure this is the intention though.

Subtle movements are all that is necessary for your Aneros to effectively provide massage. Whether this is a rocking motion or a slight in-out motion really makes no difference, just let your body dictate the action, let pleasure response be your guide to muscle contractions.
Good Vibes to You !

@devnullspoon & Kaly You didn't mention anything about night-time erections. Do you have them? Do they wake you up? if they do, that would be a good time to consider an Aneros session and see what develops. I remember when first starting with Aneros, I sometimes felt an extreme need to ejaculate about 1-2 hours after a session. I did and moved-on from there. Regarding Aneros movement, like @rumel said, subtle movements are all that is necessary. You don't need to "stroke" your prostate like your penis! It is much more sensitive and behaves differently. It can be very unpredictable. Your contractions will be sufficient. Good luck!

@devnullspoon , I had what I would call a similar experience after using my Helix classic that I interpreted as just being finally satisfied! Maybe it's not the same, and two weeks seems to be a pretty long time to go without having any sexual desire, but like some other guys mentioned here, libido is a finicky thing and stress can affect it, too. I just know that after a session with my Aneros, I'm fulfilled in a way that makes me say "Enough!" for a while. Sort of liberating, actually, to not be driven by sexual desire so much... and I'm 53 if that helps at all.

Thanks everyone for the input. I guess I didn't leave out some details. I'm a 36 year old guy in the military, I'm healthy and active.

Typically I feel like I'm relaxing well, not that I'm having orgasms but practicing breathing and stuff, the aneros feels good. My sessions average about an hour. I do notice that edging seems to cause contractions. At the end of my sessions I typically masturbate to ejaculation. There should be another word for it because it's more than simply ejaculation...firehosing? LOL

The more I read the replies about libido, I'm wondering if that part of it is stress related, I do have a lot going on right now.

@goldenboy aside from really trying at getting myself hard to masturbate, I've had zero erections, another concern 😐

Presence or absence of erections can be a lot of things. The whole time I was away at a military school - nothing, nada. And then once I was done with the school & got in close proximity to someone attractive - wham, there it was.
so many men are taught to disassociate their sex organs from their feelings. In fact it is all hard wired together in one system.

It could be that using the aneros satisfies a need not previously satisfied, and thus since you are 100% satisfied, that your body - with all of life's pressures, simply doesn't need to as for relief for quite a while.

If you don't use it, you lose it. In older men, when sex is less frequent, the libido is reduced (in my case anyways) so I have to force myself to engage my member more frequently.

Lately I have been concentrating on the absolutely great feelings my Aneros and A-less sessions give me and inadvertently, totally ignored my penis for several weeks. This weekend, I paid the price; my wife felt the urge (something extremely rare) and I could not get my mojo going at all, totally limp even if I enjoyed watching her getting herself to climax several times.

This morning, I woke up with a resolution to practice my member on a more regular basis but without ejaculation (ejaculation drains my energy) while continuing to enjoy my backdoor play.

So @devnullspoon don't despair, it could be that your system is shocked with your new discovery. For 36 years, you engaged in sexual activities in the same fashion and now this new-found pot of gold, with promises of huge returns, could be confusing your mind. Just take it one day at a time and adjust accordingly but make sure to keep the penile activities separate from your prostate activities.

Good vibes to you.