Snapped at work

For the first time in my working life, on Monday I came to the end of my tether at my workplace and snapped with my with my manager, an uncontrollable emotion of anger and stress over overwhelmed and a quit my job with full blast shouting and a smashing over a printer/laptop on to a noticeboard. These actions scared the hell out of me as well as lost me my job after after 9 years with 7 of those being great until they had a reshuffle of management who then demanded relentlessly without a care in the world. My voice was unheard and I felt like a number and apiece of equipment to be used until no longer able or needed. The company was going places now winning more work by massively undercutting rival companies within our sector and then not delivering the proposed agreed contract..yet they flogged us to death on unachievable goals and seemed to resent and blame us for the downfall. I got sick of it and ass licking lazy bastards getting the promotions ...I dont regret what I did but It scared me as I don't recognize that person I was for those few minutes. Is it normal or would you seek further help.