I have had shingles, that had no rash at all. I think it is called " non rash shingles". It was very painful (not itchy though), the doc prescribed anti viral meds ( I forgot the name), it was two years ago and lasted about 2-3 months.
That makes me think, that yours could be shingles.
funny how the same thing affects people so differently. I had no pain but was VERY itchy and had almost no rash except 2 or 3 bumps. What brought me to the dr is I sprayed the itchy spot with cortosteriod spray not realizing one of the bumps had opened and that pain made me scream the instant the spray hit my skin. Luckily I went right to the dr the next day and only had Shingles 10 days.
As long as this body works, I am going to enjoy life to the fullest for each second of every moment that I can.