Since the beginning of this year (2011), I have been experiencing the WORST stomach pains ever. I got a couple blood tests done, but everything came back normal. My mom thought it was because my stomach couldn't handle a lot of junk food I ate, but even when I don't eat a lot of unhealthy things, it still hurts. The reason why I'm concerned about being Lactose is because last night I had some yogurt. An hour later, my stomach was badly hurting. Same with this morning. So could I be ?

Thanks!!