From very recent personal experience, shingles will present itself on one side of the body (weird, I know), but I’ve learned that’s a telltale sign.
In my case, I thought I’d pulled a muscle in my left shoulder. A couple of days later there was more discomfort... felt like a long-grade flu. Then the rash appeared — mostly on the back across the left shoulder blade.
My doc took one look and confirmed... 10 days of acyclovir (I think that was it) and things improved. The nerve damage from the rash continued for over a month, though. Almost completely over it now.
*LOW-grade flu
Ouch!