I was awakened with intense pain under my left armpit this a.m. An hour later I realized I had a rash. Iced. Took 1000 mg lysine. Pain subsided. Googled symptoms and found this might be related to shingles. M.D. apt. today and given RX for Valacyclovir hcl 1 gram to be taken 1 twice per day for 7 days. Because I was not in pain and rash had lightened I was told to wait until rash returned (pain also, I assume) and then take the meds. Take pic of rash and make appt. to see my own M.D. I know there is a 24 hour window for this to be effective. M.D. said there is evidence I could have shingles and if I do symptoms (pain and rash will return). I planned to wait until tomorrow to see what happens, but I am concerned about 24 hour window. I wonder if I should go ahead and start the Valacyclovir. Thank you.