If you are already in the middle of a situation then do something practical : BREATH ! (wow... so easy) and when you are calmed enough try to recognize the reasons why you act they way you don't like (according to your post ) to act. And let me tell you, everything is a choice... if you really decide to stop with the bad temper (specially because what you are generating, physically and emotionaly, on you is going to affect no one else BUT YOU ) you will. But again, it's really important for you to unravel the 'beliefs' in your little head to see what is really happening (-:

In your mind, focus this word '忍'. Slowly, your frustration will gone.

Try to practice any activity to relax yourself but all depends on you, if you want to change your temper you have to work out on that. It is about intention and effort.

Just remember that anger is like holding a hot piece of coal, no matter who you throw it at you are the one who gets burnt in the end. That and slow breathing, that helps too :)

Would you like to change yourself for someone who is you really caring about? If you find that one, you may change yourself, inclduing your temper.