Hello Hydrowife....
I'm no expert but I believe it would most likely be impossible to obtain a prescription for medical marijuana in a state where it is illegal.
It is my understanding that in order to obtain a prescription in a state where it is legal one must be a resident of that state. It would be illegal to possess in the state of your residence if you obtained it elsewhere.
Remember... even though it is legal in some states it is still federally illegal.
I understand wanting relief from pain. I wish your husband the best in finding a medication or treatment that works for him.

Abbie
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Rest in Peace
3/8/90 ~~ 4/2/12