<s>[INST] I am a 37 year old white male. I have had several heart attacks cardiac arrest and coronary artery bypass. I have high blood pressure, and high cholesterol. I have been frequently getting very dizzy out of nowhere. So much so that it has even made me vomit. Should I be concerned enough to go to the ER [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Getting dizzy, may be due to differences in blood pressure, high blood pressure and also low blood pressure. I suggest you to control the blood pressure and to take medications, if BP is high. From the information given by you, I recommend you to visit a cardiologist too and get an ECG and a cardiac sonography and some routine blood tests done. All the best! </s>