When my PN came on, I was actually in a commercial laundry facility all morning. It then came on very sharply in my eyes first,and head, and within weeks spread to entire body. At that time I had both a bad case of bronchitis,as well as a long standing gut infection with H-pylori.

I have become chemicaly sensitive since then,and unable to tolerate a wide array of chemicals,and now as most people know I am now also sensitive to medicines too.

While I am not getting worse,and I don't have too much pain anymore, I do have alot more autonomic system issues that are unpredictable and fleeting, and distress me.

I have had enormous amounts of testing done as well that show that I am rather healthy aside from the PN.

I second what Glen has said, maybe there was a mild toxic exposure, and your immune system went into overdrive especially with a co-infection/virus. In my case it is beleived that it was an immune system attack monophasic in nature.