I feel like my insides are coming out!?

Ok this is really weird. Over the past few weeks my abdomen has been growing. I have attributed it to pms bloating since I was supposed to start my period 2+ weeks ago (I have taken 2 negative pregnancy tests, so I am fairly certain that is not the problem), but still no period and my belly is huge. I look pregnant, no exaggeration. So I noticed when I went to the bathroom the other day that the insides of my are sort of poking out when I sit down to pee. I have already had a problem over the past few months with my intestins poking out a little (sorry about the tmi), a symptom I have tried to ignore because it grosses me out. I am now wondering if the two are ociated. A couple of other things: I have been gaining inexplicable weight (mostly in my abdomen, but everywhere else too). I am a personal trainer, and I know how to eat right and I work out hard, which makes this all the more frustrating. I am also very moody and I feel the need to sleep all the time. I am so tired! Any thoughts?