don't put yourself down for eating a whole meal, congradulate yourself! instead of worrying about the calories, give yourself a break for once, you're body is thanking you for eating, as it needs the nutrition to live.

not eating for 3 days isnt going to help you. if your scared of eating as much as you did, just eat small amounts every once and a while. this keeps your energy up and puts you in a better mood. eat some grapes or something, they are low in calories and mostly water so it will fill you up.