I've had this horrible stomach ache, for the past two weeks...?!

I've had this horrible stomach ache, for the past two weeks...?

At one point, my stomach just.. started hurting. I disregarded it, since I was at school, and told myself it'd feel better later. By that night, the stomach ache hadn't gone away, it just got worse.
The pains disappeared at like.. 5 PM.
Then the next morning, they came back, and did the same thing throughout the day.
By the forth day of going though this, I just stared taking a pepcid and bam, all better for 4 hours. tuesday, i stopped taking them, and my stomach started hurting agiain. I know it's not period pains. It isn't that time of month.
I was waiting for school to let out, so I can get a doctors appointment, (School lets out tomorrow)
So hopefully I'll have one by next week,
but just so I'm prepared, does anyone have any clue what this could be? And why?

I have no idea. All I have to say is you better go to the doctor. Pain is your bodies way of saying their is something wrong. That's expecially bad if it's internall pain.