Janner - Yes, this is serious business, but it does NOT necessarily condemn you to a life of medical visits and invalidism. Not by any means. I did not have the same combination of issues as you -- I had my aortic valve replaced, as well as a bypass and a pacemaker. I had lots of medical visits and tests - for a short while. Then things settled down. My annual medical visits for cardiac-related health amount to seeing my cardio twice a year and having one pacemaker interrogation (different doc) per year. That's it. Once all the post-op stuff is sorted out (and I had a lot of that), you can go back to your regularly scheduled life. I was 52 at diagnosis, 63 at surgery, and am now 73. During that time, my daughter got married, moved across the country and now has two sons. I completed a busy professional career (60+ hours/week) and am now (partly) retired. My wife and I travel (until Covid) and I am still a gym rat 5 or more days a week.
My secret to success, I think, is to keep the practice of only "daydreaming" of how I want my life to be, rather than about how I am afraid it could be. Many of us who have been through these surgeries can attest to the assertion that the patient's attitude can have a major impact on patient outcome. At the time of my surgery, I claimed to be the "poster boy" for AVR complications. I think I hit all the speed bumps on the road to recovery. It never stopped me, maybe slowed me down, but only in the beginning. I guess I made it all seem too easy, because to this day, my wife still won't cut me any slack! Of course, she will admit that she was quite scared for the first few weeks of my recovery, but once I made her go back to work, she stopped worrying.
Hang in there. It is scary at first, but once you figure out that you're going to be fine, you realize that you are.