I think be careful here, most people I know who have chronic pain conditions do everything possible to avoid taking strong painkillers. Also putting fibromyalgia in scare quotes is a bit condescending. I battle pain, exhaustion, cognitive problems etc on a daily basis and only take the smallest possible dose of painkillers like tramodal and then only if I have no other choice. I hate relying on pills to get through a day but I have a genuine illness that I'm unlikely to recover from. There is convincing research that it might actually be a retro-virus that lies dormant until you experience a serious enough illness or injury to trigger it.Ask yourself - is it Fibromyalgia or analgesic withdrawal symptoms? Ask any healthy pain-free person to take painkillers regularly for a couple of weeks (even paracetamol or aspirin) and then stop. They get symptoms of ... guess what?
Remember folks, drugs are also toxins (just read the side-effects lists) and most are increasingly recognised to have withdrawal syndromes.
Think you have a 'food intolerance'? Perhaps your body just has trouble adjusting to the massive degree of variety in your modern diet - a variety it was never evolved to cope with. Stick with your wheat or your dairy and simplify your diet and your 'intolerance' will go away, along with many of your 'Fibromyalgia' symptoms ;-)
The Food, Pharmaceutical ('Medical') and Supplement ('Alternative Health') industries are part of the same salubrious and morally tainted human endeavour. It doesn't want you well, it wants you dependent and dis-eased.
I have certainly learned how to better manage my symptoms and improve my quality of life but I'm never going to be able to hold down a job again or go camping. I take two medications regularly, gabapention which is for nerve pain and is not an opiate and mirtazapime an anti-depressant. Both have vastly improved my health and both are vital to my continuing health. Yes taking medicine when you don't need to is not good for your health but in my case my body and brain are inherently broken thanks to some shoddy genetics and aquiring a chronic pain condition, medicine made me better, saved my life. Suggesting to people their medication is what is making them sick without any firm proof is dangerous.