Too much awareness to the body

I attended goenka course recently. When I got to day 5 in which we practiced vipassana body scan meditation. pretty soon i would get my brain really sensitive to sensations making them really strong. After a short time it will become painful and make my head dizzy and then would feel strong sickness, painful over sensitivity and confusion for the next 2 hours until the body sensitivity lowered. It even happened to me after going back to only focusing on my breath. This makes it no possible to meditate. 1) Have you ever experienced over sensitivity that made you feel physically bad? Why is that happening? 2) Can this be somehow overcome? Thank you!