HURM. Ten out of ten for the idea, minus several million for the execution of it. Remember: show, not tell. Instead of telling us that Rick lives alone and is lonely, SHOW IT. Describe how he usually lives, maybe part of his daily routine, and then explain how the incessant dripping is disrupting it. Also, when he does kill himself, it's too soon. It needs either a) moar time to build tension, or b) a greater sense of isolation. Stabbing himself in a bar surrounded by people highlights the crazy, but it feels like the means to an end. It would be more poignant if he was alone and despairing over this thing that only he can hear.
tl;dr Your story needs moar of everything.