I've been a nurse for almost 30 years! There is a very simple solution to your problem, ask your doctor for something else!!!
Not everyone reacts the same way to the same medications. Demerol and Morphine do nothing for me. I need Tylenol #3 which is about the weakest one out there now. My brother needs high doses of Morphine for any pain relief. My head swims on Vicodin, so I avoid it! I could fly a fighter jet on Tylenol #3, but it kills just about any kind of pain for me.
You can try Norco, Vicodin, Tylenol #3, even higher than over the counter doses of motrin or naprosyn. They do work for severe pain for some people!
Of course you could also hit yourself with a hammer. A greater pain often helps you forget the lesser pain!:D