Unknown source of abdomin swelling?

Okay so here it goes.
Starting five days ago I started having massive abdominal swelling and what felt like period cramping. I assumed I was just going to start a period. I am not regular and I've never kept a calender but I did have a period last month. My cramps went away about a day ago and haven't returned, but my grotesque swelling has remained. I am eating healthy I recently started eating mostly organic foods.
I'm having digestive issues lately and I'm thinking maybe that's whats wrong here? Or maybe even both? I usually don't cramp for this long before a period usually one or two days is all. I have to work to go to the bathroom, I'm consuming as much fiber as freaking possible. And when I do go it is very skinny and stinky poo. It takes several times of wiping because its thicker then usual. My poo never stunk before. And my gas is super smelly now, this too is not normal. I'm always a little gassy but it never has odor.
The swelling is horribly uncomfortable, and I feel so ashamed to go out in public I look like a cow. Please help.
Oh also, I don't know if these things matter but I am sexually active, I suffer from hypothyroid, and lately my sleep patterns have been very messed up I wake up a couple times a night.