Hi Blair, and welcome to The Waiting Room - the virtual room where many folks await their own turns at valve surgery. I spent over 9 years waiting, and I think I know a lot about that roller coaster.
From where I now sit, just over 3 years post-op, the ride on that coaster looks a lot like the model developed by psychologist Elizabeth Kubler-Ross when she was describing what we go through in grief or mourning. She described 5 stages of grief:
1. Denial
2. Anger
3. Bargaining
4. Depression
5. Acceptance
The sooner you can process it all and get to Acceptance, the sooner you can feel in control and able to get on with your life. If the roller coaster really bothers you, I suggest that you research Kubler-Ross' model to get the full description of each stage. I didn't look into this until after my surgery (my daughter works in the mental health field; she mentioned it in another context and I went on to research a bit), but in hindsight it is spot-on.
My usual advice to folks in The Waiting Room is that they do their research and make all of their decisions as soon as possible. That includes picking their care teams (cardio, surgeon, etc.), their hospital, their first-choice valve type, timing, etc. This information forms your game plan for heart surgery. Once all of the decisions are made to your satisfaction, all you have to do is to "work the plan." Just make up a calendar and do whatever is scheduled for the day. If there is nothing heart-related to do today, then you don't even have to think about it. You can "just" live your life until time for the next test, task or procedure. It may not work for every patient, but for control freaks like me, it worked just fine.
My valve issue was different than yours (I had aortic stenosis), but the decision and planning processes are the same. The goal of all the planning is to be able to maintain some semblance of sanity until it is time to report to the hospital to "get it done."
You've come to the right place. Make yourself comfortable in The Waiting Room, and ask all the questions you can think of. The folks here are like family, only better. We do not judge, and we have a lot of first-hand experience that we are very willing to share in order to help others get through the process and get back to their lives.