did you ask the doctor if you'll be able to play the piano?
i've gone 4 or 5 days without food; the same without water, which was much worse.
the reason i went without food is kinda tough to 'splain. too much going on, too much stress, and too little sleep didn't leave any time nor will to eat for a few days.
i went a coupla days without water once, when i was hiking in the mountains/desert of new mexico. we were only supposed to carry water for 2 days, but it ended up that we didn't find a valid water source to refill our canteens for almost 6 days. that sucked, let me tell you.
i still have that very vivid memory each time i'm parched and chug from a big, cold gallon of water.