William, I wish you the best with recovery. The best advice I can give is move, move a lot, and dont be far from your heart pillow when you sneeze or cough.
And the reason I can give advice...
August 17th, I went in for open heart surgery. Replaced my aorta valve, fixed an aortic aneurysm that was .2cm from bursting. While coring out the valve, there was so much damage they had to use the largest mechanical valve made which cut into the electronics so they had to put in a pacemaker. Not exactly the place I tought I would be at 36 years old. In ICU for 7 days because I initially had an external pacemaker and the docs thought that maybe my heart would fire back up. It didnt, do internal pacemaker went in. Recovery was not horrible, but I have youth on my side which helps a lot, so they say. I treated cardiac rehab as my personal gym and came out every day soaked head to toe in sweat while the others, way older and out of shapeish were there because they had to be. Keep your head up and know it's good to be alive. I remind myself everyday. Also, I HATED metoprolol. I begged my doc to get me off of it, but it was his way of controlling me and keeping me from over doing it. The rehab folks were impressed I was able to get my heart rate up in the 150 range while on it. At the 7 month mark the doctor told me I could stop taking it. Though, I am not sure you will have the option to get off of it, I would suggest asking the doc for a different beta blocker if you have any side affects. Dizzy, depressed, gain weight, etc...
Good luck William!