I Am A 56 Yr Old Male. I Had A

I am a 56 yr old male. I had a physical and the doctor compared an EKG from 2,5 yrs ago and he said they did not look at all the same. He ask me if I had a heart attack since my last visit, I said not that I was aware of..he looked very puzzeled said he would get back with me when he got my blood test back. My pulse was 70 and blood pressure was 84/132. I walk a lot, meaning 2 miles everyother day at least and never short of breath. I am going back in a week to see him but wondering what could be wrong with me in the mean time?