HI I was doing this and it turned out I had Fibromuscular Dysplasia of renal arteries. Fibromuscular dysplasia is a condition that causes narrowing (stenosis) and enlargement (aneurysm) of the medium-sized arteries in your body. Reduced blood flow from narrowed arteries to the organs can affect the function of the organs. when it affects renal arteries exercise can induce sudden large BP change. It can be in arteries any wear heart, keck other organs. So I think perhaps ask you physician to rule that out it is extremely dangerous. My GP had sent me for MRI and the radiologist overheard my symptoms adn called her to change to CT with contrast he knew what it was with the symptoms.