Hi Greda, I just read this entire thread, what wonderful help this forum provides. My left tkr was on August 20 so we are at similar recovery. Fortunately my only problem is insomnia, which is how I found the forum and I feel so much better about it now I know it is so common.
I just wanted to share a tip with you about comfort. I have discovered that a hot pack placed on my lower back at the same time as icing my knee reduces the chills and gives a bit more pain relief too. I am off the stronger pain meds now (a relief as in Australia it means a visit to the doc for a new script every few days because of the crack down on opioids) I now use an over the counter sleep aid doxylamine, paracetamol and voltarin so no precriptions needed. Anyhow, let me know if you try the heat pack and it is of any help.
Good luck!