I've been on oxycodone 20mg for 2 years and gabapentin,600mg,for 2 years, and Zanaflex 4 mgs for 6months, and for the past 4 months my oxycodone which I take all medicines at 6am except Zanaflex, seems to knock my pain down to a 6, and lasts about 4 hours then the pain comes back with a vengeance, I'm on P.M because of chronic back pain plus I've had 17 back surgeries, now I'm afraid that my doctor won't adjust it. I'm seeking any advise I can find . Thank you.