Suggest Treatment For Muscle Pain On The Legs And Buttocks While Recovering From Lumbar Fusion

I am three months into my recovery from my second lumbar fusion, this time around a PLIF. I have been having a wicked time getting any sleep mainly because of muscle aches in both legs and muscle spasms in both buttocks and legs. I have tried vallium, ativan, flexeril, and I have been on cymbalta now for several weeks but nothing seems to help much, except limiting activity. I do not sleep 3-4 days a week on average which im sure is not helping with my recovery. Any suggestions would be very helpful. Thank you,