welcome Cajete,

I would suggest cutting way, way back on your exercise for a period of two weeks to see if anything changes. I had a neuritis of the saphenous nerve for a entire year at the outlet of Hunter's canal (inner thigh above knee) that caused stinging and fasiculations. Several doctors couldn't figure it out. I was afraid it was spread of CRPS. I inadvertently discovered the source as irritation from the recumbent bike when I took two weeks off my workout. Neuritis resolved then came back when I started working out Again. I had never taken long enough off to realize what was happening. I quit exercise again and slowly added back in one at a time till I isolated the bike. Now? no neuritis, no stinging, no fasciculations. It's an easy thing to try....

good luck and I hope you find relief soon!