Nausea every morning

I am 17 years old and a senior in highschool, Recently i was scheduled to work from 11am to 7pm and i was having some trouble sleeping so i decided to stay up all night, when it was the morning i ate a leftover turkey sub from Subway. i threw up this sandwhich about 30 minutes later. This was about 1 week ago. Now i am throwing up every morning before school and sometimes throughout the day after school. I am not a stressed out person i am happy all the time. The weird thing is that on the weekends i am fine, no nausea. I started crying one day and thought about how it was going to make me depressed and after i cried i was perfectly fine the whole day. I have no appetite, the thought of eating makes me nauseous, i gag and gag in the morning untill finally throwing up stomach acid. i have been to the doctors and did some blood tests and everything came back fine. i need help. i cant take this much longer... im getting depressed.