hi. im 15.i have been haveing really bad stomach pains for about 3 days now. there not all the time but every once in a while they get really bad. it usually hurts eaither at the very bottom of my stomach or right under my chest. they kinda feel like cramps in a way but way worse, and i never gat cramps to begin with so i dont know what is wrong with me. do you know what the problem could be? :-(