I'm so sorry to hear how much you're struggling with. Rough!
You've got lots of good advice here - much of which I'd concur. Stop the Antibiotics and keep up the probiotics, raw foods, etc.
I'd also highly recommend chlorella. It's such a wholesome food and addresses so many of your concerns: It detoxifies, smooths digestion, helps with tissue repair, balances out immunity, and it feeds your probiotic bacteria.
My husband has a bad stomach. And he's also thrived on eating oatmeal. Oats soothe the stomach and their beta glucans are very good for immunity and helping curb inflammation. I make a big pot of organic steelcut oats and mix in a few eggs to make it a full meal. Serve it with yogurt and maybe a little applesauce and you've got a great stomach soothing meal.