During my sessions I'm very relaxed and comfortable, it's almost blissful. After the session tho I feel anxious and out of sorts. Maybe because of all the build up and no release?
I feel out of sorts too, I don't know what it is. That's why I tend to only have sessions before bed.
I've had this a few times as well, often after a particularly intense session. Usually I feel quite euphoric, occasionally I'm actually quite annoyed that it's over and I have to return to normal life, at least that's what it feels like but there is slight anxiety mixed in with that. I can't explain it.
There is no off switch, at least for me now. Since I woke up my prostate, it usually tingles throughout the day and begs for a session. When the session is over, the tingles continue and the only relief I can get is through ejaculation. You might try ejaculation at the end of your sessions. It seems to redirect the energy back to the penis for awhile.