What Causes Headache, Back Pain And Fever With Blisters On The Body?

The symptoms started with headaches, 1 day. The next day it was severe lower back pain, 2 days. The next day it included sciatica 2 days. One the fourth day it was a raging fever for 24 hrs. The next day, for the first time in my life I had fever blisters on various areas of my body and a sore thyroid gland in my hip. The whole episode lasted seven days and some of it still lingers. Could you please help, all I take are tylenol and cold pills. I'm 46 yr old male with no lifestyle changes.