Hello, I currently have what is being called a Ididopathic Axonal Neuropathy. I have been reading up on neuropathy since it began in 2008, does that make me an expert, no! But, if you look at an anatomy book that shows the layers inside the human body it becomes very clear that with all our nerves running this way and that way, near bones and joints, under muscles, that are nerves can be crushed, pinched, and trapped in some very tight spaces. Some people can develop a mononeuropathy just from crossing their legs all the time.
When I was younger, I had sciatica all the time. That pain was a sharp, excruciating agony that signaled for the next week I would be miserable. It ran from my hip to my foot, and anyone that has had it will agree, OWWWW!
What I have now is progressive, slow but progressive. It did not just stay in one area. My first neve pain I felt was like a two foot long sewing needle had been jabbed through my right inner knee to my ankle. It knocked me back onto the bed, when I suddenly could not feel my lower leg at all. Fourtunately it only lasted a minute. Since then the nerve and muscle pain has moved from body part to body part, including my face. I have aches and pains in my muscles, cramps all over, twitching, tremor, and edema.

I mentioned both problems for a reason. My sciatic was painful, but it never progressed beyond that area. It was a pinched sciatic nerve. This axonal neuropathy is a polyneuropathy (a lot of areas of the body) that signals a condition or disease that is systemic.
If you think about your lifestyle, is there anything that you do repetively to that area, or perhaps a one time thing where you lifted something heavy an akward. My sciatica came on because of my weight, hard work, and holding children on my hip while I carried them. Not good to walk with a shifted stride.

I hope it turns out to be something like the sciatica, because the past four years for me have not been fun.