?? question

okay so me and my not so boyfriend have had sex like 8 times now recently in the past month or so.i've been sick w bronchitis for 2 weeks now but recently starting saturday i woke up feeling like i wanted to throw up and my stomach hurt and head also, i had a huge test that day but i wasn't all so nervous for it. but i have had really bad diarrhea and headaches and saturday i even threw up once around 3:30 ish. and now it's tuesday and the diarrhea is still there and my stomach hurts still. i've taken peptobismal and and ibuprofen. what could be wrong?? plus i was supposed to start my period today but still hasn't came? is it because i've had sex a lot so it changes?? confused about all these questions ugh help!