While you're working out how to see a therapist, it could help to keep coming here and post and read. i've learned so much from others here and have wonderful support. I see a good therapist at my county clinic. It's a real bummer having to tread so softly around your mom to get what you need. From your posts, it seems like talking to a counselor or therapist of some kind is what you really need. And some help with your digestive condition would help as well.

As you may already know, seeing a psychiatrist might be a good plan after all, not to get meds, but to have him deal with your mom with his official stance. If she would take his advice, you would have referral to a psychologist who works with the psychiatrist for the talk therapy. But I realize you want to avoid dealing with her at all when she's so controlling about it all. Maybe someone at school can help and not betray your confidence.