Yes. I know the feeling.
#1 Pray. #2nd: Did you try the medical route yet? They may find something with tests that have you down like this. You need to keep trying... you are too young to be this weak.... something is out of balance. The body and mind can not operate when its out of balance in some way.... Do you have a medical person you have any confidence in? You need help.... please go give some professional a try.
Best Wishes, God Bless.