I have them. They aren't as bad now but the first time I had them was the last time I got strep, 10 years ago. My throat was swollen out to my chin, I couldn't close my mouth and my wife rushed me to the doctor because she was worried I could die. After that every time someone around me would start to come down with strep I would get those stones but not get strep. The first one I has was about 3/8" in diameter and hurt like hell coming out. Now I just pop them out when one comes in.
Both of my daughters, 17 & 15 get them as well and they don't get strep any longer since. I've told a bunch of doctors this but they think I'm crazy.