@poorpaws so sorry to hear about your heart attack...so knocks you for six.
I had one, or maybe 2 back in 2017, so know how you feel. It really takes a while to balance the medications, so prepare for a few months of "issues". It took me about 5 months to get to a point where the pills that were keeping me well allowed me to feel alive too. At one point I was wandering around like a zombie.
One thing I'd say is allow hubby to worry, allow him to take care of you because he IS worried you might drop down dead, but in a few months all will be back to normal and (if like me) you'll be saying things like "never mind, let the lady with the heart attack mow the lawn, you just sit and watch the telly..."
One really good thing is it gives you an excuse FOR EVERYTHING... I hate social occasions and work dos, now I just say "sorry, my heart condition means I can't..." and nobody judges or says anything.
27/11 will be my 5 years post heart attack, so will be celebrating.
If your local health area is the same as mine, they will work with you to build an exercise plan gradually, working with you to improve diet and exercise, and sleep, and reduce longer term worries etc. The heart health team were really helpful, if you get offered the 6 week rehab go for it.