http://www.webmd.com/webmdpaincoachapp

Here is a link to the WebMD Symptom Tracker that will generate a PDF that can be taken to your doctor.

It even has nerve pain listed as a condition.
It's not perfect, but a good start for a tracker app.

I have often thought of creating an app like this and feed the anonomized info into a data mine that can be searched by patients looking for answers.

What are some of the things that would be most helpful to have in this app?
Example, I would like for the app to track foot pain and triggers.