I'm going to the doctor's on monday.
Update: Good news is that I have more symptoms of prickly heat (or however you spell it) than I do shingles. Bad news is that (I forgot to say so earlier) my right eye is partially swolen shut (I can't see much out of it) and my left hand is nice and swollen. I don't think I'm going to be doing much of anything for a few days.
Regards,
-Dave