Feeling nausea most of the time.

I am 18 years old and when i am giving 12 board exm i have stress and overstudy,sleep late and after somedays when ever i want to eat or drink something i always feel like i want to vomit and because of this i can't eat properply. I am scared.of vomit since when i was a little and before 3 to 4 months of 12 exam i was very ill with fever and vomiting since this my vomiting problem become serious. After 12 exam i have taken pills for stomach digestion pentoprazole and some liquid medicine for 1 month and for approx 2 months nothing happened and again from before 2 to 3 days i again feel wanting to vomit and it is more serious than before. When i wake up early i feel like my stomach is empty and when i am about to have meal I again feel nausea and i haven't eat morning meal properly but i eat dinner as i am very hungry but today i don't have morning meal but i have proper dinner and when i about to sleep my stomach feel empty and feel nausea again. So is their any solution for my problem