My situation is somewhat different from yours but the feelings are likely similar. I have bradycardia and had a 2 lead pacemaker installed in Sept. 2022. Previously, I was moderately active: powerlifting and strength training, yoga and stretch and mobility. BUT, not enough cardio. I am 75. It was an unexpected shock. I am very cautious, perhaps too cautious, worried about doing too much in the cardio realm, and worried about weights. Having said that, I sleep better, don't sweat as much, and can walk with no difficulty. I am also back to yoga, stretch and mobility, and light weights. The pacemaker was an emergency, and it has taken some time to get used to it, mostly the needing it. 🙂 Honestly, it has given me my life back. I hope that with a bit of patience, it will do the same for you.