I think the pain is there for weeks before the shingles appear (blisters) & at this stage I doubt even a doctor could predict that that's what it is.
Having had fibro for many years I've found these types of pain unfortunately occur pretty often. It's not unusual for it to be almost unbearable just to touch an area for days, sometimes weeks, and then it passes....often to another area :o(
Try not to dwell on it & see how you go. If it becomes severe or you have other symptoms see your gp.
Look after yourself.