Lousy temper

Looks like I've completely lost control over my temper. I do get angry every now and then but I never express it. But of-late I'm failing to keep it to myself. I am irritated by smallest of the things and I start yelling. But yelling at complete strangers, I could never have imagined doing that, until today. I mean I get angry at strangers more often than at the people I know. I find myself better positioned to understand the people I'm acquainted with. But I never have expressed myself to strangers. But today I ended up snapping at a stranger at my workplace for having jumped the queue. I had already tolerated one Idiot for an 'educated professional'. But when another such idiot wanted to repeat the same I couldn't stand it and ended up being rude. I'm not upset at the fact that I was rude to someone coz if the chap could see a person as huge as me right beside him, waiting for my turn, then he must have been blind not ignorant. But I'm upset with this often lost temper of mine. I'm sure not all occasions will leave me unaffected. Looks like now apart from many other things I need to take anger management lessons.