Hi there,
I have depression as well as other issues, and also found out i have a thyroid disease too. If it is any consolation at all, a close friend of mine went through a major episode of depression when they found out they had diabetes. Somehow we both make it through our episodes of depression, and myself: I've tried almost every single kind of anti-depressant and am worried about choosing ECT or not as well...

Hopefully there is some solace in that you are not alone.