mayeb you're lightheaded? usually people get dizzy on forward rolls and flipping or doing giants really fast and in a row.
ur not landing on your head r u? maybe u get too nervous about it and aren't relaxed and ur so tense you get a headache? how does ur bridge kickover look?
try breathing more during the skill, and be more relaxed.
also, make sure you aren't hungry and ate a bit before practice.
did u tell ur coach? what did they say? u should tell them and ur parents if u haven't already. is this the only skill that gives u headaches when u do it? how long do they last for?
