I feel the same way if I do not get a good nights sleep. It helps to take ambien then I wake up feeling great!! Maybe talk with your Dr. about getting something to help you sleep or relax..
My stomach is in somersaults as well. I slept ALL night.... this anxiety really has taken over! My heart beat is normal..... its achy legs and nervousness and stomach in knots!
I have this, especially if I have university the next day and I haven't slept due to being up all night worrying. Even on weekends now and then I wake up with my heart beating fast and a stomach doing somersaults. Usually it calms down by about mid day.