You should really discuss this issue with your prescribing physician. In the meantime you should make a log of your blood pressure off the medication. You should also have routine screening bloodwork to make sure your kidneys, liver, and electrolytes are well-balanced. Antihypertensives are usually lifelong medication and less you can control your blood pressure with diet and exercise. It sounds like you may have been able to control it with both and therefore will continue what you're doing and discuss getting off blood pressure with your prescribing physician. You should also have your cholesterol redrawn to make sure that it is a normal range.