Okay this is very thin ice but follow me here!

#1 - DO NOT HERSELF! IT IS NOT THE ANSWER AND YOU DESERVE BETTER
#2 - Tell your Doctor that you are so desperate, and you are, that youare having serious thoughts about hurting yourself or even suicidal thoughts and that you don't want these thoughts but you feel life is forcing your hand! All of which from what I am hearing is true.

A good Doctor will do what he deems necessary including admitting you even if for 72 hours. Also tell the Doctor of your mothers obstinance, which is more likely denial! He probably knows of ways to get her to hear him out!

Plus tell momma that you are not crazy in the sense she may fear and that mental disease is no different the diabetes. It is a chemical imbalance and it causes your disease. It is called a mood disorder. She is apparently not getting the reality.