I'm 18 years young, I'm 5'2 and i weight about 103 ibs.Recently i've RANDOMLY been vomiting in the oddest times, i get lightheaded, sharp pain in my chest and then it just comes out. I thought maybe i was pregnant cause i was late so i took two test it was positive but two days later i received my period. Now im on day 5 of my period and last night i fainted and started vomiting blood. What is going on?