It can be scary as the dickens tho! Especially when it gets worse. I've been there and many others here have as well.
First check out the Peripheral Neuropathy Forum:
http://neurotalk.psychcentral.com/forum20.html
Just click on the blue above and it'll take you rite there. At the very top of this 'forum'? Are a series of postings called 'Stickies'...meaning they should stick around a while as many/most are 'keepers'.
Now, all that said? it doesn't mean that you have PN. So go to the neurologist and get a heap of tests... more bloodwork and some electo-diagnostic tests as well.
As one who has gone thru the whole diagnosis and following treatments for both an autoimmune neuropathy AND cancer? My best advice is to GO! Get all the tests done! Find out that it's NOT worse things and that it IS something that can be treated!
You aren't now happy with your situation and the more tests they do? Well, the more things can be ruled out! Then you & your docs can zero in on what your problems are, and keep them from getting worse. Then hopefully get help so they are better! When one HURTS? A person can become really grumpy! Let all your family and friends know where you are at, and go from there.
Lastly? Do NOT at this point in time worry that IT IS THE WORST POSSIBLE IMAGINABLE NEURO DIAGNOSIS! 90% of the time? It's a let down but? At least you'll have a name and some help as to what to do about it all.
You say 'damaged back?' HOW? If you don't mind? You mite want to look at the Spinal Disorders forum as well - http://neurotalk.psychcentral.com/forum22.html

Good luck and keep faith in YOURSELF that you KNOW something IS WRONG. Then go and do your best to get some things right! 'S - J