I agree with the others. You need to get out of the house. Talk to as many people as possible about
your situation. You might find some solution--a place to sleep and put your stuff. In the meantime, try to have as little contact with them as possible. They are abusive. No one deserves abuse.
Come home only when you need to. Try to come home after everyone is asleep and leave before they wake up. If you can, take showers outside. Study in the library. Keep extra clothing in the car to change into when you need to. Basically, only come home when you absolutely have to. BTW, I've been there only I was much younger.
Figuring out how to reduce a flare or get into remission is a trial and error experience. Don't expect your GI to have all the answers. He was trained in making diagnoses, prescribing medications, and surgically removing the colon. He was not trained in alternative treatments. That's why they are called alternative treatments.
What works for me: Fecal transplantation, Probiotics, Anti-inflammatory foods, No HFCS, No crystalline fructose, No foods high in fructose, No artificial sweeteners, No pro-inflammatory foods when flaring, Vitamins, Lexapro (for stress).