I've also got a filthy mouth, but because I spend a lot of my time posting and chatting, I have to stop myself from saying those words.

When you're angry, it might help you to defuse if you try thinking of creative substitutes for swear words, some that would be acceptable to the mainstream sites' filters. It might help your mind focus on something besides what is making you angry.

For me, it works better some times than others. Sometimes I want to hold on to my anger, because I deserve to feel bad. Just remember that you won't always feel this angry about what is bothering you. At some point, that same thing won't bother you so much. Just get through that angry moment unscathed.