this has happened to me once with a third party vendor. however, my definition of 'yelling' is my boss's definition of asking nicely - my boss is 112398 times the meanie of anyone else. so he actually gave me a pat on the back for that, the one time I really lost my temper.
has anyone mentioned the incident to you? I think maybe you could apologize to the PM, and otherwise don't worry about it. i guess also if you have a chill/relaxed relationship with your boss (IMing during the day, joking around etc) it wouldn't hurt to feel around that situation with them. it depends on what the situation is - a lot of jobs fully expect 'creatives' to be a little crazy, and even though that is a false stereotype, you can use it to your advantage as a get out of jail free card...as long as it's played infrequently :)