How can I get a pot prescription when the law pes in New Jersey?

I suffer from a condition know as Multiple Hereditary Exostoses. What are basically jagged tumors grow around my joints and can cause severe pain. The bumps end up ripping or hooking on to part of my muscle, with pain so bad I've already had three surgery's on my knees in four years. The only thing that stops my knees from aching is pot, my stomach is too sensitive for painkiller meds, and I tried getting morphine injections but my knee got even more messed up. Do you think this is a valid reason to get a prescription? I know that by laws in other states chronic pain is a valid reason but I'm not terminally ill just in a lot of freakin pain.