I Came Home From Work Today, Started Cooking Dinner, And

I came home from work today, started cooking dinner, and all of a sudden I begin to get this pain somewhat underneath my breast. I stopped what I was doing and sat down. However, this did not ease the pain. My chest feels a little tight as well. At work today, I felt a little short winded.. the air quality is very poor in the building. it was hot all day.