If I eat alot of icing on a cake or something REALLY sweet, I feel like puking?

I just ate a snickers bar, and I feel extremely sick. If I drink milk I feel better. Why is that? Its only on certain things though.. if I eat for a example a hersheys bar, I feel normal, ice cream, chocolate milk, sweet tea, I feel fine but SOME icing and snickers bars make me feel sick... why? Its really weird. then i drink milk and feel fine?