I would suggest going to the doctor armed with a medical study on the topic. This study is the only one I can provide at the time, it pertains to the use of drobinal with spinal cord injury patients. Drobinol is a THC derivitive, so of course the natural route of mmj is preferred since there are no side effects such as vomiting, stomach pain, etc.
Clinical Studies and Case Reports

Best of luck to you.