I'm slowly losing my mind

I haven't slept properly in nearly 3 months and I feel like I'm going crazy. Obviously I still sleep but usually around an hour per night, 3 if I'm lucky. I got 6 hours throughout the entire week and I'm exhausted. I have my final exams in a couple weeks and I can't even focus in class, I'm fighting to stay awake. It's funny. I always fall asleep when I shouldn't but never when I should. I'm 15 so no doctors will give me medication and all the therapists I go to say it's just stress. I HAVE BEEN LIKE THIS SINCE 11. It's not stress. I need help and noone cares. Idk if I can go on any longer. If lack of sleep doesn't kill me then I might.