My husband is 56 years old, 6 feet tall, weighs approximately 250 pounds, and currently takes no medication. He has been experiencing fatigue, light-headedness and dizziness. He had these same symptoms about 3 to 4 years ago. He actually collapsed at work back then, and so his primary who sent him to a specialist, they ran a bunch of tests and couldn t find anything wrong with him. He is leary of doctors and is waiting for his next blackout/collapse before seeking medical attention. Do you have any idea what could be causing these symptoms? Should he seek medical attention before his next collapse/blackout?