Vomiting with migraine then feeling hot then cold

Patient: I have gotten migraines since i was 11 and im now 14 this migraines are very painfull and its a classic migraine bright flashey lights then pain then i vomit then i sleep. i always vomit but reasently after i vomit i get really hot for a few minutes then a get cold a can usually sleep the migraine off. but why am i feeling so hot then cold