Have you tried Oxycodone? I started my pain management taking Xodol which is Hydrocodone but it got me so sick no matter what dose. I switched to Percocet and that worked for me.
Those Fentnayl patches are the devil to me. Just about OD one day when cleaning out my garage to get my car inside before a storm. I didn't realize the patch was on me until I started to sweat. It dumped the entire dose into my body and I thought I was dead. My wife watched me over the next few hours and luckily was fine. It was my fault but once something happens like that you'll never do it again.