Asalamu Alekum
Well I just complain to Allah subhanah wa taalah, and there was someone in my life whom I shared all with but I can't talk to that person for some years now, annnd I almost have no friends now or the ones I have have more important things to do, nice friends... so anyway I actually rarely get angry alhamdulilah, just when someone says something bad about Islam then yeah am like a volcano but without eruptions, however, I do reply to that bad thing if I can without having to be rude. Oops now am talking about me instead of how to control anger, ahm excuse me...In short, just remember Allah when angry =)