They are hard to find but typically the doctor you would visit to get your MMJ license renewed would prescribe the opioids or refer you to another doctor that is MMJ Friendly. Another option
is for you to ask the doctor for a prescription for
Marinol...it
is synthetic THC. I should mention that when my mother was dying from cancer, she said that the Marinol wasn't helping her eat, it was only the real marijuana that helped but things may be different for you.
Good luck.