stood up and my stomach felt like it fell or maybe twisted. now i sometimes get

[keelan j]

this weird feeling.? Okay yesterday about 4:15 pm I was sitting down and then I stood up and my insides kinda felt odd when i stood up. idk how to explain it really. well then i was worried about it, but i started to calm down, but then i started getting a little bit of a pain right above my belly button. it freaked me out so i took my dog out for a walk cause that calms me down and i did run. I felt better after that, but yet later i still felt like uncomfortable above my belly button to my ribs. Well today i woke up and i felt a lot better, but when i went to go pee i maybe sucked in my gut and i got a little bit of that feeling. Well i ate little to nothing today until about 5:00. I had some ice cream cause i was starting to get hungry. I started feeling odd again. Then my mom came home and made me french toast about 6:30 and I had no problems. I also have been drinking root beer the whole day. About 8:00 i had a pop tart and i got this burning feeling above my belly button. I've had it for a while now and it has felt better. What could this be? Also I'm only 15.