I had angioplasty a year ago and i follow a strict diet but still sometimes i suffer from minor pain. is it because of stress as i have of my work?

Chest pain: It’s hard to tell. You will need further testing. If renarrowing occurs it often does so within the first year. I would recommend seeing your cardiologist again. They may wish to do a stress imaging study to insure blood flow through that artery is normal and insure there are no other arteries that potentially may have significant blockage.