Hello MG,
I just read your recovery thread for the first time. I'm a little ahead of you, as my TKR was on 12/19, but I've been through most of what you described (no groin swelling problem!). Totally understand the "electrical shocks" and found the same fix--no weight on the toes/foot. Absolutely can't stand to have the blanket on it! That's lasted a couple of weeks now, I think, but seems to be getting better. My ex-husband had diabetic neuropathy in his feet and couldn't stand the weight of even a sheet on them, so there is a definite nerve pain that can be caused by even slight pressure on the toes. As your nerve endings heal, that will dissipate.
It sounds like you're coming along very well. Congratulations on your addiction recovery, and especially being able to go thru this on Tylenol alone.