I don't know what to say, I can only refere to those days back when I had 24/7 gas and rectum gas too and I felt like I couldn't get up from a chair because if I did the air would come out. (it did come out even on the chair btw) ...but now I've crawled my way out of it. I can only talk from my experience but i did had a lot and lot of gas at the time and I think fissure + lot of gas kinda created this LG deadly combo. I cured both by quitting vegan diet (too much gas and protein deficiency), fissure therapy and muscle growth.
About your situation, did you get checked for spinal damage? it may account for nerve damage, which is a possibility... http://www.spinalcor...-sacral-sparing
Also, do you feel it numb when squeezing, do you feel the air pass, ever ? I didn't in the beginning... As for fissure, internal fissure are not like outer, I didnt have any idea i still had it when I went to the doctor because it was inside and wouldn't bleed or anything.
Also having air pass at all times even with the most sealing things can only be explained to stating that it is you that unintentionally let it pass (by you I mean your brain and not your own will). I am just assuming.... because if it really was all prolapsed you would actually see your colon sip out of the rectum. (Again I am just assuming... When I say it is anxiety I just try to explain that our leaking could be like those people who have twitching.. like they blink their eyes all the time and stuff like that. that's the kind of unintentionality I am talking about.. and the nxiety effect I am talking about.
the heaviness on your pelvic floor I can totally relate to but when I work with kettleballs and do abdomen it kinda gets less heavy.
Maybe spinal damage could be a possibility?