FIBROMYOSITIS: What do I have to do to relieve the pain?

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I have been diagnosed with Fibromyositis, an inflammation between the muscle and the tissue. I experience chronic pain all over my back, but mostly, on the upper left part of my back and the neck. My Ortho advised me to take arcoxia (pain reliever) continuously for 10 days. And if pain still persists, I have to go back to him and he suggested that he'll inject me with steroid injections. Now, I did what he told me about the pain reliever and never went back to him yet. I'm kinda scared about the steroid injections. Are there any other ways and tips you would like to advise me on how could I possibly reduce the pain?