I'm A 32 Yr Old Male And Have Always Been

I'm a 32 yr old male and have always been very energetic. here lately for the past few months all i can do is sleep which is making it very hard on me because i work 7 days a week. i literally wake up in time to work sometimes fall asleep at work get off go home and go to bed. some days it hits me so hard being tired i sit down and pass out then all of a sudden I'm ok for a little bit then tied again. what can this be? i can't find a doctor they all want applications before seeing anyone and i just don't have much time nor the energy to go before work