Hi Angela,
First, sorry for all you're going through and hope you'll get more answers. From reading about hereditary neuropathy, there are specific tests that need to be performed including genetic and family history check. The EMG will confirm your condition but I am not sure how much it will tell in reference to heredity. i just had an EMG/nerve conduction test last month which confirmed my condition and added cervical and lumbar radiculopathy. I just hope you have a knowledgeable and compassionate neurologist to help you through this. Please do also focus on the psychological aspect of your condition and surround yourself with a good positive support group. It is really vital.
Hang in there and I wish you the very best. Take care.
gus