What Causes Motion Sickness, Nausea And Vomiting On Entering Water?

Hi, may I answer your health queries right now ? Please type your query here...i have been experiencing motion sickness within minutes of getting into 92 degree pool water with my baby for swim classes. i have very low blood pressure and wonder if this causes the motion sickness and what i can do about it. I leave the pool after his class feeling nauseaus and often vomit.