something weird..

So I was masturbating earlier and I do it often enough so I'm used to doing what makes me feel the best. Sometimes I'll orgasm but for some reason today when I did, I felt a sharp and then persistent throbbing pain? It was so strange and that's never happened to me before. I can't even truly remember exactly where I felt this pain but I'm pretty sure it was focused in my labia majora (the outer lips in case you forget the technical lingo). And it went away as soon as my pleasure stopped because pain doesn't turn me on. Is this normal? I'm nervous to try touching myself or having someone else touch me that way again because I didn't like it at all and I don't want this to keep happening. Does this happen to anyone else??