I'm in nursing school now and worried a lot about this before starting. The trick I've learned that gets me through a situation that makes me a little dizzy is consciously remembering to breathe and wiggling my toes. I feel that as long as I remember to breathe, my body's fainting reflex shouldn't kick in and toe wiggling to temporarily take my focus elsewhere. It has worked so far (knock on wood!). Best of luck to ya! :)