What to do when you are nervous suddenly?

If the patient is suffering from chronic diseases such as coronary heart disease, hypertension, hyperlipidemia, etc., most of the palpitation is caused by myocardial ischemia. At this time, nitroglycerin should be taken to dilate blood vessels and restore myocardial blood supply. If the patient suffers from anemia, hypoglycemia, hypotension and other diseases, he should rest in a supine position, and at the same time, he can properly eat sugary foods or drink fructose drinks to supplement energy, and then he needs to adjust his diet and rational medication for treatment.