Your experience sounds a bit similar to mine. I am very tiny but often wear baggy shirts to hide my bloated/distended belly. I am terrified that someone will think I'm pregnant!
I am also taking Paragone (you can see my thread a few posts below this one).
A lot of your symptoms actually sound like Celiac disease. Have you tried going on a gluten free diet? It helped me feel about 80% better a few years ago, but since then I think the parasites have gotten out of control and I feel sick again. If you want advice on going gluten free, feel free to send me a message.
Good luck with the doctor. I hope they find out what's wrong.