Is extreme swelling and itching normal after laser hair removal treatment?

I got my first laser hair removal treatment under my chin and upper neck and the next day my chin and under my chin was severely swollen to the point where I could not look down and I was itching really bad. The nurses think I was having a severe allergic reaction to the histamine used. They prescribed some pills abs I have been taking them for 3 days but the swelling is slowly going away. Is this normal and how long will it take for the swelling to completely go away?