Hello, Firstly, this high bp can cause all your symptoms including dizziness. So we need to monitor blood and get your antihypertensive Optimized. If it s persisting even after bp control then there is possibility of atrial fibrillation, in which heart rate suddenly goes up and also suddenly decreases. Blood pressure falls during these episodes and one has dizziness, fainting, blackouts, sometimes syncope. Usually ecg is normal as it is usually done in between the episodes. ECG done during episodes will show abnormality. You will need 24 hour holter monitoring. So visit nearby cardiologist for these investigation. Also, hemoglobin and thyroid test should be done. ln order to abort such episodes you should try to cough hard. Till the time your evaluation is complete, you can ask your local doctor for tab Metoprolol. Hope this helps you and get back if you have any doubts.