Stage Lighting And Effects Equipment

i have anorexia and usually eat 500 calories a day but yesterday i didnt have anything and i was working all day and moving around a lot so i woke up stupidly hungry. today i've eaten 3500 probably more like 4000.. will i gain any weight from this? i also skateboarded for about 45minutes and did around an hours walking and i have a hour dance class later
i had: 6 squares of cadburys chocolate
a snickers bar
a malteaster bunny
a reeses nutrageous bar
a salad
a bowl of fruit n fibre
4 mini crossants
half a share bag of big chocolate buttons
30g serving of crave cereal
skinny caramel macchiato from starbucks
1 roast potatoe
and some other stuff i cant remember