I hope the new meds help. I know it must be so difficult for you to see him in so much pain. Marijuana would likely help with the pain and increase his appetite. For me, it comes with mental/psychological side effects that I find unpleasant but I know it has helped a lot of people. I don't know if medical marijuana is legal in your state. If it is, a cancer patient should certainly have no trouble getting a prescription. Hopefully what you have now will give him relief from his pain.