What Causes Hair Thinning While On Lyrica And Flexeril For Fibromyalgia?

I was diagnosed with Fibromyalgia. I was prescribed Lyrica and Flexeril. I stopped taking both during the summer as I don't ache as much during warmer months and I can make do. But, in the winter, I have more pain. Since I started taking the Lyrica and Flexeril again, my hair has started thinning again. It had started to grow and people even notice it had thicken up from the bald spots. Now its thinning again.