Thanks for writing to HCM! I have read your query and see that presently you have headache, dizziness and light headedness from some days and are on lisinopril for hypertension from past two years. You also reported having disturbed periods this time. From my clinical experience, I think that you should visit a doctor / may be a gynaecologist. If you are sexually active, I feel that one should rule out pregnancy by doing a urine test because your periods are disturbed along with other symptoms. This you can do at home also by using first urine sample in morning. Getting an ultrasound abdomen and pelvis will rule out anything related to your disturbed period which could be related to your current problem. I think you also need to get your blood pressure (BP) checked, as BP fluctuations can lead to dizziness and light-headedness. So, it can be corrected by adjusting dosage of lisinopril. however, you have not mentioned the reason for takin amoxicillin, which can again be related to this presentation. hope the answer helps you. please feel free to ask if you need more advice. Dr. Manisha Gopal