What physical symptoms did you have, can I ask? I've recently been diagnosed with general and social anxiety. I've had the social anxiety for several years, but the general side was never much of a problem until around my GCSE exams. From there, it just worsened. In the couple of months after I started my A-Levels, I was ill a fair bit - I caught cellulitis twice and had a recurrent case of conjunctivitis. I still get headaches that border on 'migraine' and I have chronic insomnia.
I understand totally where you're coming from. Despite having anxiety, I'm not an anxious person, as in I'm not afraid to leave my house. However, I do fret about some things; when make some decisions, I feel like there are a million different outcomes I need to consider, and once I've thought about those, another thousand pop up.
Sometimes, there just isn't a reason for the anxiety to appear; it just does. I know that my anxiety has worsened because of my exams, but there are some things that I don't need to be anxious about.
I hope this helps x
(Also, what are you studying at the moment? GCSEs, A-Levels, degree?)