First I want to say I am terribly sorry, I know exactly how you feel. Not too long ago I was in the same situation you are - not sleeping because of pain, crying all night and forcing myself to go to college in the morning.
I finally found another doctor that was very knowledgeable and believed me (that's half the battle sometimes) and he put me on a new medication that saved my life as I know it.
So what I am saying, is there is help, sometimes you have to wait. Do you have access to other doctors? Sometimes you have to see 5 or 10 before you find the answer you need. I would try to find another doctor.
Let me know if I can be of help to you.