What do yo do when you are feeling upset?

What do you do to calm down and relax when you are feeling upset ? I am upset because I feel like my husband doesn't seem to understand and appreciate me going through preganancy. But he is sleeping peacefully next to me not knowing I am upset. But I can't go to sleep because I am upset :(  I don't want to wake him up and start a fight. What do you do to make yourself feel better ?