Been getting chest pains for years, ekg shows problem P wave. Did I have heart attack?

I’m a 43 year old female. Has acid reflux but been getting chest pains for years .but these pains I’m have now are like pressure in middle upper chest got a ekg .and doc said they seen some in my p wave. So sent me home wit appointment to my doc.the next day they did 3 ekgs and they all said borderline. What does that means? He didn’t seem worried but he set up appointment wit heart doc so confused . Did I have heart attack? Mean while I’m still having chest pain .By the way have a history of anxiety . And have been super super stressed