I'm sorry to hear this. No I do not believe this is shingles fortunately.
However this seems like a bug bite or some form of contact dermatitis. I'm glad to know the antihistamines helped, you can take them for a weak or so. Take an ibuprofen with it like Tylenol and apply a cold cream (without fragrance) or an antibiotic containing cream that's available OTC. This should also be relieved with icing.