Don't worry about feeling unprepared for this recovery. It's one thing being a nurse and a completely different thing being a patient, as many of us have found.
Unfortunately, many surgeons don't prepare you adequately for the recovery. They reassure you how much better your life will be when you've recovered, but they don't prepare you for the very long time it takes to recover.
I think you actually have to go through a TKR and a recovery before you understand that.
I'll ask someone to make a signature for you , so that we can see at the bottom of each post when you had your surgery. That will b e easier than having to go back to your first post to find your operation date.
I gather you had a PKR on November 21, 2016. Is that correct? And was it your left or your right leg?
Don't worry about that flexion yet. There's plenty of time, so don't push or over-exercise your knee. ROM (Range of Motion) can continue to improve for a year or more after surgery. So, continue to rest, ice and elevate your leg, dn only exercise gently, to try and help the swelling to go down. It's the swelling that inhibits ROM at this stage.
Since you're still getting pain at night, it's too early to reduce your pain killers. You're still taking them on a schedule, I hope?