SC, it's been 6 years since my surgery so I can't remember for sure. You know, it's really hard for me to discuss this subject because it is very private but I do it because I remember how desperate I was at the time feeling like I was the only "freak" in the world with this problem. So I am here because I don't want other people to feel like they are alone and that this is a medical condition and not a psychiatric condition that's all in their head.
I remember that lying down was the worst position and it was almost impossible to sleep -- I barely slept for months until my docs finally consented to some medications. Also, after BM's was awful because the muscles would spasm. I used to get up many times in the night to use the bathroom so in answer to your question about a full bladder -- if I remember correctly, emptying the bladder was a relief. But I agree, the feeling is enough to drive you insane because you can't concentrate on anything and it takes all of the joy out of life.
PNE since 2002. Started from weightlifting. PNE surgery from Dr. Bautrant, Oct 2004. 80% improvement!