I get that extreme difficulty peeing from many serotonergic stimulants... it can become pretty bad, though if I try really hard I can at least get the barest trickle out, and given enough time, I can get my bladder like half empty. makes me feel like I'm damaging my prostate or something with those things. When that's happening it's also impossible to get an erection. When I don't touch any of those kinds of drugs, I don't have those problems.
I have had a similar sort of problem peeing from dissos (sometimes, not usually) as I do from being on strong opioids... it's almost like my bladder just gets too lazy to work and I have to stand or sit there for like 5 minutes before it wakes up, and then I can pee just fine.
I can definitely relate to the "having to stand there for 5 minutes before my bladder wakes up" thing on dissociatives. I used to attribute it to a kind of nocebo about being aware of the bladder dangers, but it's since happened enough times that I guess it has to be an independent phenomenon. Although I have not seen it widely discussed at all, actually, this thread is the first time I can recall seeing it discussed anywhere, so nice to know I'm not alone in this. Even once it starts though I've had the sensation of not fully emptying my bladder fully. It's only somewhat recently I've managed to kind of relax about this a little and not stress myself about it ruining or wasting the good parts of the experience standing in front of the toilet. I try to time peeing so I go just before redosing but, I don't always get it right and still spend a fair amount of my disso-time standing in front of the toilet trying to find my way to the usually fairly straightforward mechanism by which I can open my urinary sphincter. I've tried sitting down to pee, sometimes that helps a little, although not much and not always.
I don't usually have a problem peeing on opiates, although I can detect that it doesn't come quite as easily sometimes.
Serotonergic psychedelics are a mixed bag for me, I've had an experience on acid before of not being able to pee at all until the trip was all but over, I think in this case it's partly an anxiety thing, partly maybe vasoconstriction, similarities to whatever the mechanism is that makes peeing so difficult on MDMA - the latter of which I have never in my life been able to get an erection on either.
I've used more dissos than is probably healthy or advisable in my life though and I think with dissos this problem becomes more apparent with overuse - I recall earlier in this thread Xorkoth, you mentioned that with K you can just come out of the hole and go to sleep right after, while this used to be true for me, and I used to never have trouble peeing on K, it is no longer true and after coming down from a heavy dose I experience some kind of overstimulating NMDA rebound which can almost completely inhibit sleep unless I was either already tired before I dosed, or I take a benzo.
I do recall one experience a long time ago now when I combined tramadol with K and had a lot of difficulty peeing to the point that I started to get worried - although I was eventually able to, probably when I started to come down a little from the ketamine.
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