Sounds like fleas and lice, or 2 diseases if you prefer. Your thumb symptoms could be related to your neck as Glenn suggests, or more likely secondary to carpal tunnel syndrome with median nerve compression at the wrist. See someone in sports med or occupational med if you want it evaluated further. If it went away, I would not worry about it, except maybe trying to avoid whatever it was you were doing that made it flair up. Kinda like that old Groucho bit: 'Doc, it hurts when I do this' 'Don't do that' bs (I also would not take medical advice from somebody who signs his posts 'bs'