Reason for heart attack. At a early age?

My age was 27.I had a sedantary life style. I was chewing tobbaco. I was in stress.i had a heart attack And then angioplasty With 1 stent. I think this is too early for me to have heart attack at a early age. On the day of heart attack. I was sitting in my shop i was in a good mood on that day. Suddenly a customer came i had a fight with him.not physically just verbally for 10 mins. My hands were shaking so much. I was very angry. Then after i got normal then suddenly pain came in my chest like hell. Then i got to the hospital  then angioplasty then icu. One year passed now i quitted tobacco totally. I walk 30 mins a day without any gap.my echo was done my doctor said u r ok go on. Wanted to ask 2 questions. 1) what you think is reason for my heart attack at a early age? 2) if i fight with someone again non  intenstionaly is that going to happen again like hands shivering and chest pain. I m scared of this please clear my mind. So i can live a better life.