You exercise more than your body can accept. Have you just started exercising? Maybe you still can't accept it. Take your time and increase your exercise every day.

In my experience, are you running too fast and running in the wrong posture? I once rode a spinning bike like this, and I felt sick and went to the bathroom. 10 minutes later, I'm going to ride a bike. The coach told me the posture and speed of cycling, and I was much better.