I say this as someone who is lucky enough to live in a state where it is legal; it has helped immensely with my medical problems. I think for now, as others have suggested, you would be better off either going to a state where it is legal and stocking up, or finding someone who can get it for you. You don't want legal problems on top of your medical issues.
The problem, as you know, with buying the street drug is that you don't know what is in it. For medical purposes you are going to want something with a high CBD content and a low THC content.
One thing that I use for pain that is supposed to be legal everywhere because it does not have any THC is a product made by a company called Sacred Herb Medicinals. It is an anti-inflammatory pain stick that you rub on the afflicted area of your body. It contains CBD from hemp oil, which is not illegal. The company is in Bend, Oregon. You might try ordering it from then.
Good luck! Please let the group know how it works out for you; I know there are many people who need access to Cannabis for medical reasons who can't get it yet. Hopefully that will change soon!
= new reply since forum marked as read