Fatigue

We talk about fatigue a lot in weight lifting and working out, but I just feel it ALL the time. Sometimes I feel tired in my sleep... I am seriously, mentally at least, addicted to caffeine, and its not even working anymore. I'm just walking around in a complete mental fog. Its ridiculous. Exercise used to give me more energy- but it seems to just be wearing me out. I just want to lay my head down and fall asleep, I don't even care if my back and neck get sore either...Just can I close my eyes for just a minute? Please...? ...So tired and bored.