Your symptoms are caused by insufficient blood supply to the brain and have nothing to do with menstruation. Menstruation will not cause serious dizziness, weakness, nausea and other symptoms, and your dizziness two years ago has nothing to do with menstruation, so your symptoms this time have nothing to do with menstruation. Cerebral blood supply deficiency is common in diseases such as abnormal blood pressure (hypotension and hypertension), hyperlipidemia, hyperglycemia and anemia (there are also some rare diseases, which are not convenient to elaborate here).

Symptoms of cerebral blood supply deficiency include: intractable dizziness, dreaminess, insomnia, listlessness, irritability, memory loss, nausea and vomiting.

I suggest you go to the hospital for blood pressure test more often (because the problem of insufficient blood supply to the brain is mostly caused by blood pressure, and most young people are caused by hypotension). If the blood pressure is normal, you can check the blood lipid, blood sugar and blood routine (excluding anemia), and you can basically find out the cause, and it won't cost much (100 or so).

Cerebral blood supply insufficiency has been one of the chronic diseases in medicine for many years. If you are interested, you can check my Baidu space, which has detailed instructions.