I Had Shingles Vaccine At 50 Because My Father Had

I had shingles vaccine at 50 because my father had a really bad case of shingles.. I had chicken pox at 3 years old. I had a mild case of shingles just on my midriff at 15 years old. I am now 70. Can you get a booster shot? I am freaked out that I will get them! A friend who is also 70 and had the vaccine now has a terrible case .