I am sorry you feel empty. i know that feeling too. sometimes people get very exhausted taking care of relatives and friends, which i think there is reason to be this way. a person can only give so much before they break. don't overwork yourself, can you take some time off your job? Lack of sleep is an issue with me too. try to get more sleep and i'll bet you'll feel refreshed, that's if you have the time to sleep, but it is important which is what i'm saying.