Swelling becoming uncomfortable

I haven't had the conditions you described exactly, but a couple of times after longer sessions (2+ hours) and especially without a wet O at the end of the session, I felt uncomfortable tightness and dull soreness around the PC muscles or the anus area. It felt good in a way because I felt I was having ongoing arousal, which once actually led to a series of strong Aless contractions without even planning! However, I was concerned that the ongoing tightness in addition to being uncomfortable when not engaged in sexual activities, it also might mean the prostate was swelled and contained fluid that had not been drained, which in the long run was bad for health. So I started getting in the habit of ejaculating at the end of an Aneros session. The tightness was "cured" but then of course the frequency of playing was reduced as well naturally. In your situation, I suspect your long sessions have put too much pressure on your prostate. Your situation just sounds more severe than what I've experience. Let it rest and recover. As for whether ejaculation at the end of each session is necessary, I've heard some say it's not for them, so YMMV. You can test it out. I think no matter how good it feels, health should remain the top priority. Good luck!

@seanyea Thank you so much for your response. Haven’t tried in a week. I’m going to try Monday and see if the tightness & swelling continues. Hoping the time off will resolve it. I had a number of penile ejaculations to try to flush the prostate out.