First I have to say, how is it that the Easter candy lasted that long?? Around our house--it would be scarfed down BEFORE Easter---hah!
And about the birthday cake... how about freezing a slice or two for yourself to enjoy AFTER you reach your goal? It was still be good! The more times you say "just this once", the longer it takes to get to your goal, and the more times you have to go through the dreaded days 1 through 3. Just hang in there, get through it, save the treats for after you get to your goal, and then just have a little bit here & there.
I have my Valentine's day See's candies nuts & chews, and my Ferrero Rochet hazelnut chocolates, and my Easter Snicker's eggs waiting for me, for sometime this summer after I'm at goal & am on maintenance (Sorry--I probably should not have mentioned all those tempting things--but they are my faves!). Then I will savor them-- a little bite here & a little bite there, and won't scarf down all of it at once like I used to do!