How to describe the feeling of riding a roller coaster?

After a long wait of more than three hours, I finally got on the roller coaster. I'm really excited. There was only a creak, and the roller coaster began to move slowly upward. Slowly, the roller coaster reached the highest point and began to sprint down. I suddenly feel that the whole person is flying, and I seem to be falling.

Then, the roller coaster dived, rising and falling for a while, with my heart in my throat and my body leaning left and right. At this moment, there came a slow voice "Welcome back to Earth". I woke up to find that the roller coaster had stopped. At this time, my brother asked me, "What's the matter, are you afraid?" I bravely said, "Not at all." My brother smiled, so we got off the roller coaster.