Just when i thought my cough and cold was better, i keep coughing. Why?!

I'd been at home sick coughing my a*s off over our President's Day weekend and yesterday i went back to school. But i kept on aggressively coughing IN SCHOOL and it was so embarrassing because at last period yesterday we went to see an African music assembly at our auditorium, and there were not that many people there so if I coughed EVERYONE could hear me. Well I coughed like 5 times but kept in 5 coughs (We had to laugh at some things and every time i tried to i'd give a LOUD cough) to avoid embarassment. And I couldn't drink anything (i don't drink anything during classes but i should've brought something since i was coughing.)

So before that I'd been coughing and sneezing since last Wednessday and i got picked up from school because of it. And my coughing is so bad that i cough severely and i can feel my intestines or some body part pushing back inside me. And when i cough, i do it 3 or 4 times each time.

So how can i still stop my constant coughing? (Should I bring a drink to my classes? Or do something else.....)