Dave, My porcine valve only lasted a little over 4 years so I know exactly how you feel. My diagnosis was last May and had an On-X mechanical valve replacement November 1. They talked of TAVR but a lot of things come into play when having it done so be sure and ask a lot of questions. I chose not to go that way as I understood I could only have it done twice and at age 61 now I wanted to have the full surgery now as opposed to when I get older. Made sense to me anyway, but maybe things have changed.
I am 8 months out now and doing well. Surgery was about the same as first but my healing time was a little longer. INR testing was a big thing for me at the time but have found it to be pretty mundane. I still go to coumadin clinic once a month but it is already routine.
The decisions were hard to face the second time and I definitely had some worries but what are you going to do? I chose my doctors and surgeons, asked a ton of questions and did not stop (still don't), and then put it in their hands along with the help of my higher power.
Best of luck to you and will follower your journey if you share with us.