If the headache and nausea are caused by low blood pressure, the first step is to raise the blood pressure. It is recommended that the patient can take oral raw vein drink and light saline, and if necessary, also intravenous injection of ginseng and dopamine, which are relatively fast in raising blood pressure. If the blood pressure has improved and there are still symptoms of nausea or headache, it is possible that the patient may have cerebral vasospasm or a certain degree of gastrointestinal flu, and it is also necessary to further rule out whether ketoacidosis is present or whether it is caused by acute right ventricular myocardial infarction. It is recommended that the patient should undergo further blood tests, ECG, and blood pressure tests, as well as myocardial enzyme tests to help rule out acute coronary syndrome. Take care to give appropriate rehydration to help maintain blood pressure.