Quote Originally Posted by KSH

Also, I know that when I workout really hard and push myself... I get queasy feeling. Many people vomit when they workout too hard for their fitness level.

Remember, what works for one person's stomach, may not work for another's.
What I said in my previous post... just cause you are queasy in the tum doesn't necessarioly relate to something you have eaten. See if you can check your heart rate as well as monitoring what food you have/are eating.