I get very agressive in crowds?

i get aggressive, Adrenaline pumps, i physically move people out of my way, i get clammy skin, feel dizzy and sickly like im going to puke, i barge through crowds using my physical build and yell abruptly for people to move out of my way and can take up to 2 hrs for me to calm down from my rage. i am usually nice, calm, polite, caring and handle a general shop with the wife except when isles get congested or in large crowds. Is there a name for this like a phobia or am i just an deep down? example, i tossed a bloke aside who is twice the size of me, i pushed a child out of my way and barged and yelled through many more until i felt an urge to just thump the crap out of someone and had to leave my wife at the shops to finish while i calmed myself down out in the car park away from everyone. I have had this for as long as i can remember and keeps getting worst. im afraid i going to severely hurt someone. i need to know what i am/have so i can try fix this. i dint want to go to my doctor as i don't want him looking at me like a freak or send me to a loony bin.