Hi, I Have Had 2 MI One In 2007, And

Hi, I have had 2 MI one in 2007, and another 3 Mos ago. At the time of MI I had EF of 25 I just had a new echo showing no improvement. I go back to work tomorrow, I take metoporol xl 25mg and Lisinopril 2.5 for the last 8 years would you recommend a different medicine? I am also just 45 Female. I have much more endurance then I did 3 Mos ago and jog walk for 20 min a day alternating 1 min of each, also 10 min on elypitical. It makes me sad to be sick any suggestions?