swimming with hypertension

I have recently been diagnosed with hypertension, and it looks like I will need to join others on medication to control it. It came a surprise since I do not smoke or drink, am not overweight, try to eat right, swim very regularly, and feel great. I guess this body is getting old and starting to break down! I will assume some swimmers are using medication to control high blood pressure. Know of any issues with hypertension, medications, and swimming? What do I have to look forward to?