Have you ever had anxiety so bad before an exam it's made you unwell?

Anxiety can happen to most people in their lives but in some cases, some people suffer more than others when it comes to things like exams. I remember I had a friend at school who would get herself so anxious and worked up before an exam she would make herself unwell. Wasn't intentional it was just her way of reacting to the nerves and the anxiety.

Have you ever had anxiety so bad before an exam that it has made you unwell? What exam was it and how unwell did you end up, did you ever find a way to deal with it?