wandering, waning

For the past few days, I've been feeling, disturbingly, empty. It's been a long time since I've felt this way. I can't quite put a finger to it. Empty, is really the only word that describes it aptly. I know I'll get over it, sure enough, but this feeling sucks so bad. I genuinely feel that my heart is empty. That all it is, is an organ that's keeping me alive. That all I'm here for, is to take in oxygen and exhale you-know-what. That my existence is merely to complete some sort of cycle of life. I just feel..weird? I pick up the guitar, play a bit, and just feel like shit. Resentful. What's going on? My God, what's going on??