Ok So I Dont Know What To Do. I Always

Ok so i dont know what to do. I always feel as tho im half asleep, during the day i sometimes go into auto pilot and when i snap out of it i cant seem to recall what i had done. The only way i can perk myself up is with an unhealthy amout of coffee and redbull which i feel is doing damage. I've had several jobs now, heaps of different work loads and keep being fired due to a lack in motivation. I have tried diets, different sleeping patters, vitamin supplements etc and cant get myself up and going