The FAQs section of that forum has alot of info.
The whole forum is based on a treatment of sarcoid. Their treatment however is not commonly used by most doctors yet.
The sarcoid info in the FAQs portion is very long, and based on many patients there asking questions.

here is another link:
http://www.stopsarcoidosis.org/sarco...FQsiIgodIybOiw
which lists symptoms.

There is also a relationship to Vit D and sarcoidosis:
http://www.sarcinfo.com/faq.htm

So you should get that tested also if sarcoid is suspected.

If your PN is confined to the feet, I also think a good evaluation by a podiatrist is needed. Many foot issues can cause pain there. My son has a pronating ankle which was minor and not visually obvious, and had terrible pain when he started college and had to walk miles per day. A simple orthotic changed that completely.