Horrible pain after PIV sex with aneros in

My god man, wow that sounds rough! No I don't know what that could've been. Maybe overworked your prostate with so much activity, although I'm sure it felt so good while you had sex with it in you. 

Yellow semen usually means that you have urine in your prostate that hasn't been able to get out of you properly. This was told to me by someone who holds certificate in prostate massage. I'm not saying you have problems. But that's what she told me: white semen means you produce semen and its vacating the prostate properly every time you cum; yellow semen means there is crystallized urine trapped in the prostate that is getting released during ejaculation. Its possible you were so sick that your prostate flared up; did you take antibiotics for your illness? Once the tip of my penis was irritated/infected and I don't know what caused it. My doctor at the time didn't seem to care about it, but the meatus was fucked up and very red and inflamed. It went away on its own. One thing that helped though was prostate massage and ejaculation, and that semen was pretty gross and discolored, too. I wasn't sick at all, just had a problem with my meatus. 

Have you had yellow semen before? If so how often? What was the semen like when you came on your wife before the pain set in? When you came this morning what color and consistency was your semen? I don't think working out lower body had anything to do with your pain, unless you got things moving down there and just needed to pass stools. 

Sorry you had to endure so much pain, but I think it was because you needed a bowel movement. You experienced the discomfort in your rectum, but that doesn’t mean it was the source of the problem. The body can be funny like that. I have experienced similar discomfort after a long session. In my case, I’m certain it’s caused by my anus auto-fucking and ‘sucking’ in air that moves into my colon. The cure for me is ‘fuck-farting’ (sorry if this offends). It’s completely odourless so it’s not as gross as it sounds, though it sounds loud! 
If it happens again get to the bathroom and do all you can to provoke a bowel movement… or let the farts rip! I hope you’re over the infection and that your next session is pure pleasure. 

Gosh man I'm sorry.  My first thought is that you shouldn't be asking us, you should be asking a doctor!