By the way, some six days ago I got a feeling of a kind of tingling pain on the right side of my scalp, and when I brushed my teeth I felt pain in my gum on the right side. I didn't think much of it at first, but yesterday I got blister in my scalp as well so I went to see a doctor today, and it turns out I have shingles. So now I'm on valaciclovir, the pain isn't as bad as I thought it would be though.