I worked for a vet in the 90's and they said too much cortisone cause it to get diabetes. I think too much of anything is not good. Agree do your research before jumping into anything.

I have had 36 injections between my shoulders neck and head and the only thing it does is numbs that area for a bit makes it swell and hurts for a few days. So I personally don't think it does anything for fibro. I bought some aspacreme ointment and tried that on temples cause they were having a party without my permission and it helped calm the nerves down for a little bit. Also look into magnesium oil and epsom salts the 2 together in a bath are suppose to help ease they pain, I'd try it but I would be afraid i wouldn't be able to get out of the tub once i sat down having hard enough time just moving slowly lol

My one Aunt had MPS I didn't know the symptoms I always have knots in my shoulders and upper back just figured it was from my neck injuries

Look up Myofascial Pain syndrome to understand how trigger point injections can help. MPS is a friend of fibromyalgia and I suffer with both. MPS creates knots in your shoulders and upper back which causes severe pain in thst muscle.
I will be starting trigger point injection on March 30th and trying dry needling instead on lidocaine. My doctor said that I would have to drive to Victoria for lidocaine injections which is two hours away. I only trust my doctor anyways so told him that only he can do it. So thats why I'm trying dry needling or saline injections. Can't remember which one. fibro fog. I will try to update progress when possible. I believe in trying anything new that might help.

I have to have injections in both hips about every 3 months because they don't last on me. Doc will only do one side at a time. Without the injections I can't even lay on either side and I am a side sleeper. Can't sleep on my back because my heart stops, so now I have a dang CPAP