As a med student... what vaccines have you had so far?
Some people react to vaccines and develop nerve damage. This is an autoimmune reaction.

I know that many nurses get Hep B at entrance to nursing school.

I see from a previous post here that you have a history of binge drinking in college?

This link has some new research about alcohol damage that is coming to light now:

http://neurotalk.psychcentral.com/post1109420-353.html

It is possible you have more than one cause for damage..and they are adding up.

If you do not consume the nutrients to aid in repair, or you are one of the unlucky ones who genetically cannot repair because of failure to make the nerve growth factors, then as the damage occurs, it is not fixed by the body and remains. Our environment will continue to damage you, so some people in effect develop a chronic nerve damage condition.

CMT as Susanne states, is genetic also. There are many types of it and presentations. So you may want to look into that in more depth.