Dear Jiggered,
You may want to look up RSD. I am not implying that this is what you have, it could be MS or or Fibro or any number of less affective problems. It's just that I know people with RSD, and MS, and this may be a place to start. Only a doctor can tell you what it is that you have, so the first stop that you should make is to contact a neurologist as soon as possible and make an appointment.
Nice to meet you
Lily