Can anxiety cause prominent brain ventricles? and does it mess up your heart. i've always had high heart rate.

No and no: No, anxiety does not cause prominent brain ventricles. It can increase your heart rate, but it doesn't "mess up" your heart. Some people with anxiety attacks have been found to have mitral valve prolapse (mvp), but this does not come from anxiety. Mvp usually causes no symptoms or hemodynamic problems unless severe -- in which case, a cardiologist would be helping you.