Hey, might be a question for your doctor. Any tingling is probably not a good thing though. And I'm with dav125. 8 years is a long time. I'd speak with someone about an alternative to pain management!
Good luck!
Possibly,,The way pain pills work is they mess with a person's brain chemistry..8 years is a long time..Might want to consider changing that lifestyle and see if you can get by without relying on them anymore..