I'm not a doctor so take eveything I say with a major grain of salt (no pun intended!) Sounds like it could one (or both) of 2 things . . . one is a bit of congestive heart failure from too much fluid around the heart caused (maybe) by the salt. If he gained 5 pounds quickly and his feet and ankles are swollen . . . he's retaining fluid and that makes the heart labor. It could also be too much exercise. Lots of heart patients push themselves too much too soon (and others baby themselves and hardly move) . . . gotta find a good balance. In any case, the best thing to do is call your primary care doctor or your cardiologist and ask for advice. I found post-surgery very scary - is that feeling normal? Or is my valve about to explode?? It took a while to get a good feel for what wasn't a big deal and what merited a call to the doctor.
My aorta replacement surgery was about 50 days ago. When I first came home I would sleep 14-16 hours a day...and I have 8 prescriptions.
PRAY HOPE AND DONT WORRY.....its gets better week by week.