jealousy

I don't see myself as a jealous person. There may be things I may not like but I've always felt like my husband makes me feel very loved and cared for. Today, we had a dentist appointment and there was a young woman that was his dentist. I felt completely insecure and crazy jealous. I had never felt like this with him. Mind you he didn't do anything wrong. Once we were done I went off on him because I was so upset. Right now I fell kind of bad because he really didn't do anything wrong and I was so upset for something that he had no control of. Has anything like this happened to you ladies?