Hi and welcome but Oh my goodness!!!! Yes, you are expecting way too much, way too soon!!!! At 3 weeks post-op I was homebound and my life consisted of a home PT coming 3 times/week and me doing PT exercises 2- 3 times a day, followed by icing and elevating and a nap pretty much every day. I had very little energy, was in intermittent pain, tired easily and felt like my entire life revolved around my knee. I should have given it a name! lol
Thankfully, I had wonderful friends who brought me meals a few days a week for the first month and came to visit me regularly. My sister was an angel and stayed with me for the first 2 weeks taking wonderful care of me. I was on regular pain meds for approx 2 months post-op and was resistant to taking them after about a month, because I thought I should not really need them any more by then. I also like you thought I should be feeling much better than I did at that stage. How not true did that turn out to be! Thankfully, I found this forum which was a Godsend for me!! Also, my sleep was not normal at all. Up until about a week ago (and I am 11 weeks post op- left TKR), I was waking up in the middle of the night and then up for a few hours before I could go back to sleep.)
This is a huge hit to our body and it takes TIME to heal. Listen to the cues your body is giving you and follow them. You will need regular pain meds, regular icing and elevating and lots of naps. Do not try and do too much yet. It will just hinder your recovery. You will feel better in time. I am getting better with each week that goes by, but still have quite a way to go. BUT, I can see that I have made progress, that my recovery is NORMAL for this type of surgery, thanks to the people here and am slowly getting my energy level back. Just know that what you are going through is completely normal and to be expected!!!
Hugs.