One suggestion that I've used with positive results is for your master to allow you to carry a notepad with you. When you are ready to mouth off, keep your mouth closed and write down whatever you were going to say instead. At the end of the monthly cycle decide which things you said are serious problems that need to be addressed and which were only brought on by the agony of PMS. Discuss rationally the real problems and destroy the emotional outbursts you wrote down. It works best if your master doesn't read it of course.