Hello Im A 53 Year Ale 6 Ft 3 Ind

hello im a 53 year ale 6 ft 3 ind I weigh 295lbs I am having trouble with passing out, In the mornings I usually have a doughnut, im a diabetic so I shouldn't but I do anyway after consuming a doughnut I will pass out, fall out, nod out I don't feel tired, Im alert and all the sudden after many attempts to wake me by my friends I wake up and half the day is gone, I go out, blank, asleep? pass out for up to 6 hours. My friends have tried waking me up but have failed they shake me yell at me slap me pour cold water on me nothing works until I wake up myself what could be going on, Im having tremendous pain in the middle of my left leg as if my bones are on fire, I ache a strong dullk pain which continually gets worse until im forced to straighten my leg and tense the muscles up