I easily get tired by a small run. Not even a quarter mile. My weight is 72 and height is 5" 10. I dont hav a habit of exercise. I hav a great problem of tiring. I can't even sit in a movie for more than 140 mins. It causes me huge suffocation. I have a sleep of a good six hours a day. If I go in my bike for some work. I am completely exhausted and sleep in the afternoon for a while. Shall I do any tests for haemoglobin or iron.