I have had my student loans discharged and like bebop said they will send you a form and a form for your doctors. You have to really prove that you can't do anything and yes I'm on SSDI also and I had to do the fore barance(sp?) the first couple of times and then I finally got them taken care of. However, IF you decide to ever return to school they will go back and pick up what you owed and tack that onto your next bill.
So make sure you do not want to ever go back......
Good Luck,

Crew