I'm sorry you are facing yet another round of surgery,
@TIC1015 .
I know how that feels. I had a THR in December 2019. Less than a year later, my knee failed -- but I couldn't have surgery for another full year because of COVID. It was difficult for a while, but I tried to look ahead, and focus on what I would able to do once I recovered. They gave me my life back and am so grateful for the surgeries.
I'm glad to read that you are walking well and have little pain after two knee surgeries. I'd say your TKRs were a success, and that should make you hopeful for the future. While post-op blues is normal, it sounds as though you may be struggling with something more. If it was me, I would see a therapist for meds and some talk therapy.
Meanwhile, we are here for you.