Hang on, go to the new doctor, go to the hospital if you have to. Just hang on & insist that your new doctor listen to you & test you for the things others have suggested here. Your depression could very well be linked to as yet unknown medical problem or being complicated by one. Your physical state greatly impacts your mental well-being & if it is badly out of sync, then mentally you can go off the deep end. Keep going to new doctors until you find one who takes you seriously!

Hang in there.

Kim