I'm only 18 and my doctor didn't know exactly what was causing my...

I'm only 18 and my doctor didn't know exactly what was causing my stomach to bleed so he dope me up on Omeprazole. I have only been taking it for about 4 or 5 days and I feel increased drowsiness, that only benefits me me because I struggle with insomnia. I find it difficult to keep my eyes awake and concentrating in school is a burden. I have very mild headaches and I feel like I am getting sick. I can't stop sneezing, my eyes are watery and blurry, and my saliva and snot are tasting awful like medication. Anyone have answers for me???