Hi, wow. Haha, I actually googles "obsession about bowel movements" and this page came up. I have the same kind of feeling. I also don't want to go anywhere unless I feel "empty". I know what you mean, because you feel more bloated and "full" like your lower abdominal area is poking out and you can breathe easy. I also eat to "push out" what ever is in me. I'm not quite sure about it either, however it is partly somatic. I have realized for me anyway that to be "regular" I have times when I go and I essentially have to relax, or else I can't go, which makes me even more nervous which makes it even worse. Too, if you have an anxiety it may stop you from properly going, 'cause sometimes you're just to tense. It helps to try and think it out, i.e. I'm nervous and I am worried I might not be able to go. I'm afraid I might nott be able to go because etc etc. either that or try to just relax and not think about it, but if you cna't stop from obsessing thinking it out helps alot. It was sorely controlling my point at one life which may seem extreme, but I also knew that stressing over it was making it worse. You may just need to get to the root of the problem. See someone about it or try and rationalize it through your own mind. I wouldn't mind seeing someone, but at the moment I want to see if I'm strong enough to beat it my self
best of luck to you
<3 Kianni