I'm sorry that your mother won't seem to listen to what you have to say. 16 is a difficult age as it is, you are between the adult, and yet still considered a "minor" in the eyes of the law. I do not think the drs. CAN treat you for depression
without the express permission of a parent/guardian....etc.
as you are a child in their eyes. You can get birth control w/o a consent, but help with your head is different!!
You are going to have to find an open window of opportunity for yourself and your mom, or try a counselor at the school you attend. That will open her eyes. Don't do anything rash, keep trying....sooner or later someone will answer your call.
Good luck.