Oh, Beesknee, I'm so sorry for your knee troubles! I think there is a general tendency in the knee surgery world to under-advise and oversell the results of these surgeries, or so it sounds from everyone here.
I think you will soon hear from others here who have dealt with similar issues, and one of the Moderators will send you the list of articles, which I found very helpful when I first found Bonesmart in 2016.
It may be that, if you can wrap your brain around a longer recovery timeline, that you'll heal well and be back to normal sooner than if you push too much and are too hard on yourself. I've heard many here say that the timeline for knee recovery is nearly the same for a PKR as a TKR, so if you can modify your expectations, maybe it will be less frustrating?
Hang in there and know that there are a bunch of us here to commiserate with you and cheer you on as you recover!