Oh what a terrible constellation of diagnoses and symptoms... so tough.

Why are you taking GABA otc and not prescription Gabapentin? Gabapentin has been shown to improve sleep architecture. Plus, Gabapentin is used in fibromyalgia treatment.

What form of magnesium are you taking? I believe there is only one form shown to help, look up what Matt Walker says about that. There are many forms and one beats the rest. I do not remember which one.

Agree that Remeron might help and is worth trying.

Who is your primary care provider? Who manages and coordinates your care?