I actually was going on diet ,i stopped my diet for 4 days , increased my calorie intake coz i felt my metabolism slowed down , i gained 1kg in 2daysy?

Vague: Hard to figure out your question except for your concern for gaining weight with a slower metabolism. Might depend upon the type of calories you took in and if you are exercising and drinking a lot of fluids. You may want to consult with a nutritionist (local hospital, clinic, etc.)

Diet: When the person fast for long time and eats rarely then the metabolism slows down, but if you elect to eat the same amount of food by in multiple divided small meals then your metabolism will be faster and there is a good chance your diet would work better especially if also you do some physical activity. Drink a lot of water, and introduce yougurt in your diet and you will get a better diet regim