I have found the sugar connection. For a friends birthday they got me a gluten free cupcake (I'm celiac). It had lots of frosting and I can assure you the cupcake and frosting tasted fantastic. I rarely eat any pastries or candy and definitely not in that large an amount. Within 4-5 hours I felt my whole body tingling. It took a couple of days for it to calm down. This made me pay attention that I had also been eating 5-6 prunes everyday for bone building. I finally noticed that my feet/toes would start to burn, turn red and tingle in the evening; I took all 5-6 around 3-4 PM. I stopped the prunes and I didn't have any burning/tingles. I never made the connection with sugar /carb intake before but it sure makes a lot of sense.
I've haven't solved the whole problem of sugar since the wrong carbohydrates or too much carbs can have the same effect. Had a good sized apple and some garbanzo beans and had the burning again.
Now I'm in the process of designing a diet that I can live with and reduce the PN.
Also I am not diabetic but that doesn't necessarily mean I'm not pre-diabetic.