I believe I may be about to have Shingles. I have had the vaccine, but I went to ER with some burning and irritation on one side of my face., ear, and pain inn my lower back. No rash yet, but I want to avert the full blown shingles. Is there an antiviral that I can take? The ER Doctor asked me if I ve ever had Shingles, but did not prescribe anything.