I had chickenpox twice as a child, pretty close together, one at 3 years and then again at 7 years. I know it was thought at one point it was supposedly linked to diabetes, as I had it at 3 and then became a T1 at 4 years immediately after. I didn't get shingles until I was turning 36. I didn't find it painful (although I was frequently told that I had to be in a lot of pain) but it was uncomfortable. I had a rash appear on one side of my body - that looked like I had been hit with a sword in the upper torso.