So you're at about 2 weeks? If my experience was anywhere near "normal"...I'd say you're right on track!
I had the night sweats/freezes too, and I think its related to the meds because they seemed to decrease as I was able to cut down on the pills. My sleep quality also improved as I cut down, so you might be able to look forward to that too.
Until I found this group, I didn't realize the true magnitude of what a TKR is, and I was thinking that I'd be back up and walking and driving and cleaning the house within two week--whatta joke! That's been the most difficult for me to deal with, the fact that it takes time and its baby steps in the recovery...baby steps with LOTS of PT!
Weezy