Sounds like you may have an autonomic neuropathy issue...which is a component of PN.

Autonomic neuropathy can include BP and heart rate issues as well as difficulty initiating urination, urine retention, and GI problems like gastropareis (delayed emptying--which caused bloating, discomfort, nausea, etc). It can even cause vasospasms, sexual dysfunction, respiratory problems (central apnea), and sweating dysfunction.

You might want to consider autonomic testing.

http://en.wikipedia.org/wiki/Dysautonomia

Thanks, and I think you are right about some autonomic involvement. I guess I was just wondering if the pattern related to the symptoms might point towards something like a particular underlying cause, i.e. more towards an autoimmune disease.

Any autoimmune disease that affects autonomic function or PN can present with your symptoms. But there are also other causes of autonomic dysfunction & PN, like diabetes. Actually, diabetes is more common to cause PN and dysautonomia then autoimmune disease.

Have you had your blood glucose checked? What about a glucose tolerance test (the long one)?

Do you have any other odd symptoms that might point in a direction of a particular autoimmune disease...like malar rash, joint pain, profound fatigue, dry mouth or eyes, joint redness or swelling, etc?

Celiac is just one test but being sensitive to gluten is very common, can't test that. I do not eat gluten. Autonomic neuropathy can include digestive problems for sure. I use diet ( LOW carbs/sugar) with high nutrients and the best supplements and my Infrared dome and FIR pad to help microcirculation for the nerves.

over the last few years. A1Cs typically run about 5.2-5.4; fastings tend to be from 90s to as high as one hundred and teens, but usually a little over 100. So I know I have had off and on pre-diabetic readings over the years for those, but also some in the higher normal area too. Glucose tolerance tests have shown that I'm actually a little on the low side of things at the end of the test (the third hour). Have also had a moderate positive ANA on more than one occasion.

Wish I could piece all this together...if it's possible.