Anyone following really strict diet? Does it actually work?

I am just asking because I have been diagnosed with crown disease. I already have Ankylosing spondylitis and now wanting to know if I have vasculitis.. So I am asking of these diets really put away autoimmune disease away..

I am starting one diet right now as last resort. I don't wanna take meds cause they don't make me feel that good but if I can't follow a my diet plan I'll go back on meds.

My specialist says that it doesn't do anything, maybe it can't help a little but it's mostly meds that will help me the most.

I just wanna know about you guys. Did anyone really put autoimmune disease away for good following strict diet?

Sorry for the English, it's not my first language.