carbonated drinks and stomach pains.?

ok, everyday i have been having the problems of my stomach hurting. i first had the problem with drinking cokes, then it became mounten dew and well all carbonated drinks, so i stopped drinking them and today i drank a slushy, well about an hour later i had really bad gas so i went o the bathroom and then it felt like i was about to throw up and that i had eatin something that upset my stomach but yet the day before i drank the same kind of slouchy and it didn't bother me.