I'd get a Vit D test to see if you need a higher dose of that.
1000 IUs is fairly low. I'd also find a gelcap type, rather than a dry powder tablet. I think absorption would be better with a gelcap. Adequate levels of Vit D have shown a reduction in pain for those with chronic pain issues.

Most doctors will use Ultram (tramadol) for pain, for Fibro patients. If your diagnosis of Fibro is accurate, the new thinking is that narcotics don't work for Fibro patients, so doctors will not be likely to offer them. Studies have shown that pain receptors in Fibro patients are different, and already filled with endorphins compared to other types of pain states.

If your PN has been demonstrated to the doctors' satisfaction,
addition of Elavil may help with healing. New studies show this antidepressant actually works in the periphery to improve nerve function. I have posted about this recently, if you search "amitriptyline" you will find my post.

And there are Lidoderm patches. These work well, but require some experimentation to find the right spot to apply. Applied wrong, and no relief is the result.