What iz wrong with me!!?

That can be true about you being half-lactoseintolerant. That can happen to plenty others. It's normal. My baby cousin had the same effect on her since she was born she couldn't drink chocolate milk no matter what nor strawberry milk. She's lived with it and tried having BOTH strawberry and chocolate milk and she's had diaria for 4 days straight. So you don't have to worry about anything. Hope I helped and good luck.