My rheumatologist diagnosed me with fibro and prescribed compounded low dose naltrexone (LDN) for me. It has very few side effects -- most of which pass in the first 2-3 weeks.

LDN has been studied by Stanford University for use specifically for fibromyalgia. Unless you must be on opiate pain meds for some reason, you may want to do some research and talk to a doctor about whether LDN may be for you.