. . .it IS a very common disease. Approximately one in fifteen people will experience some degree of peripheral neuropathy in their lifetimes.

There are at least 300 possible causes, including the many hereditary ones--though coffee is not usually listed among them (not that caffeine can't make you jittery, but the EMG results do suggest there is something going on).

I concur with the advice to check out the Useful Websites section here, and one good place to get an idea of the possibilities for cause--and it might be a good idea to get a consult, as some of those causes are harbingers of worse stuff, but, conversely, some are treatable--is the Algorithm for the Evaluation of Peripheral Neuropathy, AKA the Poncelet Protocols:

An Algorithm for the Evaluation of Peripheral Neuropathy | AAFP

And, if you want to get some feedback from online support groups which have people with similar stories, check out the Western Neuropathy Association website at HOME :: Western Neuropathy Association. Full disclosure--I am on the Board of Directors there.