Every so often I get an extremely uncomfortable and painful discomfort in my stomach. It seems to happen in the morning the worst and afternoon it dies down (has not happened at night). I'm only 15 and during school it happens frequently and I start to feel dizzy, I can't  concentrate, sounds and movements make me feel very uncomfortable, I have to use the restroom IMMEDIATELY, and I become nauseous. I don't know what could trigger these strange feelings but it is really painful and inconvenient when I go out to places. This has been happening to me this last 6 or more months and more recently has been affecting me. If anybody has had those feelings please help.