I cheated on my diet?

BADLY! I've been on a diet for about 2 months lost 8 pounds( and yes ive cheated a little throughout the 2 months but not like this) yesterday i had a bagel (bad choice) then skipped lunch then my family went out to dinner i ordered only a salad but then they got appetizers i couldnt resist i had 2 mottzarella sticks and 2 chicken wings, THEN it was my sisters bday so we made homemade cake so i had cake, THEN i had one of those small bags of skittles. ugh. What's even worse is i woke up this morning and had a piece of that homemade cake i can't resist it it's so good..then 2 seconds later my dad walked in with a bag of bagels kill me im dying for one it's so hard to resist bagels. HELP will i gain weight from everything i just ate in the last 2 days?!