Oh wow, I didn't expect a response to this old post at all, let alone within a few hours! I live just south of Boston. I've heard from several people that there is a place in Framingham that does nothing but write medical marijuana prescriptions. I can't think of the name of it but I'm sure you...
I see that this post is almost a year old. Hopefully you've gotten everything taken care of. If you're still having trouble finding a physician to write you a prescription, there is a place in Framingham that specializes in MM prescriptions. Look it up.