Not all diabetes responds to diet; some MUST be treated with medication such as insulin. Your mental illness may really need to be treated with medication in your case because of the level of your problem; your symptoms may not respond to simple therapy. Your symptoms are pretty severe and I think we are just expressing a hope that eventually you will understand that there are options out there that probably will improve things for you if you can see your way to try them. You aren't there at this point, but it sounds like your treatment providers sure would like to see you give meds a try because they seem to feel some confidence that your symptoms would improve as well as your quality of life.