Natural remedies for fatigue?

I desperately am in need of something other than a stimulant for energy and to sustain my energy. I literally feel as if my body is slowly dying everyday and I am perpetually trying to wake up. I never once during the day don’t feel exhausted. I rely on caffeine everyday and sometimes I think it makes me MORE tired! It’s insane! I can take a nap after drinking a Red Bull. I do drink at least one a day. I know its not the best for my body, but in desperate times, it’s all I can think of. I also drink coffee. I don’t really overdo it, usually 2 or 3 at the most of any caffeinated drink and only one Red Bull. Again, it doesn’t help much at all, but it’s better than nothing at the end of the day. I want to know if I need to do a cleanse or load my system with vitamins, something like that. I have 2 kids and a job so exercise is usually not existant. However, I don’t see me doing any exercise if I can barely take care of myself and my kids and my house. I barely succeed in that everyday. Any holistic or homeopathic suggestions are welcome also. help!?!