You didn't say what you take to help you sleep. I used to take Amitriptyline and then later Trazodone. Now I just take Melatonin 3 mg. It helps me sleep and although I don't wake up completely refreshed at least I am not walking around in a fog as I did with the meds.
I am so glad that the doctors finally recognized Fibromyalgia as a disease. Took them long enough!
I have Fibromyalgia and "foot in mouth" disease from "Fibro fog". Drinking Green Tea seems to help some. But there are days when what I say doesn't come out quite right... Seems to be because the body is in fight or flight mode at all times and our brains can't engage in regular conversation. We either speak too fast and step on our tongues, or speak slowly and say the wrong words.... Only thing that works on my pain is Naproxen. Ibuprofen is like taking candy pills and Tylenol isn't much better. There used to be Orudis available that works on Fibro pain also - but can't find it in our area.
Look up Low Dose Natrexone (LDN) and medical marijuana for helping with fibromyalgia pain.
I do not have fibromialgia. But I do suffer severe anxiety, and take medication for it. I have experienced what you explain about not being able to get words to come out. It happens to me when I am very nervous or upset. Sometimes if it's really bad, I can't talk at all for a little while. I think in my case at least, that it's due to anxiety, not meds. I think you should see your doctor and ask about possibly raising your dose of anti-anxiety med a bit, and see if that helps. Blessings - Blu