Felt a little dizzy

My day was pretty good today, finally; for the past week, I have not had the best time at school. But I went to 3 classes today and they were all fun and informational. Towards the end I got a little nervous, because I started to feel a little dizzy, and I felt like everything was starting to shake and get weak; I was not happy, I wanted to stay for a kick boxing class, but like I said before I started to feel a little dizzy. But now I feel fine, because I ate and now I am going to start my homework and finish the night of with a few exercises. Hope everybody had a great day!