I feel all your pain. Dealing with most of your symptoms at this time too. I take a probiotic daily, VSL#3. You can buy directly from the manufacturer. It is a little pricey, but I would pay anything to feel better! I am also taking antibiotic Xifaxin. 3x a day for 14 days. It is expensive as well but my Dr sends a coupon along to the pharmacy which helps. I do try to follow the Fodmap diet to reduce gas.
I hope you find relief soon!
Mrs. P