Your post is interesting. A friend just passed away from cancer. He had the same complaint. Maybe it was his medication and not the cancer that made him so uncomfortable.
I don’t know what oral pain medicine he was using at home.
Dude, I still try to keep my posts small since the horrible disintegrating pain from my hip. We are talking about level 10 pain here! Oxycontin was the pain killer prescribed. It makes you sick. You loose weight. It is quite awful! I would have never made to my surgery without it. Not everyone is a drug seeker.
I got off of it, period.