Small fiber neuropathy DOES cause myopathy in some people. I have neurogenic myopathy, which simply means the muscle is dying off due to lack of neurons. It is mild, supposedly, but they took such a small hunk, so who knows.

If you are sure you have small fiber, the myopathy should not be a huge issue, unless you get steroids....I recommend not. Steroids cause myopathy. Steroid myopathy, and it is a bear.

You may also want to be checked out for the other myriad of diseases that cause myopathy. The neurowustl site is a good place to start.