Yesterday I Woke Up At 2:30 In The Morning And

Yesterday I woke up at 2:30 in the morning and started throwing up everything. I threw up 8 -9 times after that even though I did eat anything to throw up. Before I would throw up each time I would get really hot and start sweating before and during while throwing up. After each time I stopped I got really cold and it would repeat itself. I noticed when I stopped throwing up I got dizzy and today I am having a really really bad headache and don't know why