DEAR DR. ROACH: I have been urinating blood for several weeks. An X-ray revealed a kidney stone; however, I am in no pain at all. The stone is said to be between my kidney and bladder. I take blood pressure medicine and an aspirin a day. The problem is this: If I don't take my medications, the bleeding stops, then when I do take them, the bleeding starts back up again. I don't have heart disease. -- C.L.