I have a two year old son. he's quite a handful. I'm trying not to yell so much, but sometimes I lose it. What should i do after i've yelled at my kid?

Cool yourself down and think why is he doing that and what should you do about it. Think of ways of explaining so he'll understand what you're trying to bring across to him. Do you believe in naughty corner? If you do, let him know that he's going to the naughty corner for a time out if he were to do something wrong. At that same time, you can give yourself some time out thinking about how to bring it across. :)