I get that, though sometimes I do cry but a lot of the time I laugh and I can't stop, I sound like a mad woman sometimes. Even my bf asks me why i'm laughing and I just can't answer him.
somebody told me that when you smile you feel better. so when i couldn't stand it, i tryed smiling, but because of that wanted to cry. so instead i laughed, and it really, physically helps. but i think it only hides your feelings, and then after you stop laughing you feel only worse.