Hi,
I hear you how hell like that early recovery part is. For my 1st surgery I set very high expectations and over did it too! This time around I set the bar low which is more realistic. My daily goal is to do a tiny bit more than the day before with less pain. To achieve that, I ice, rest, rest, rest, do some of my exercises ( i split them off in 2-3,sessions with icing and rest in between). If I feel like crashing in my bed, I go crash. Hubby and son are "demanded" to pick up the paste in the house...this is team work.
For the stairs I have used a crutch on the good side and the railing on the bad side. I find a crutch more stable for me than a cane, but it can also be done with a cane. The physio showed me how to maneuver the stairs. Ask your physio to show you how to do it. It is slow and a good workout the first few times but you will surely enjoy the reward and accomplishment of getting to the other level. Plan your trip well an insure you are well rested and iced before taking on the journey of going up or down a level in the house. Make sure you plan rest and ice before going back to your main level that 1st time!
Hang in there, I did feel the way you do but trust me , all the hardship of recovery will pay off and you will enjoy your new knee when it is healed! I realized I had made the right decision for the 1 st and decided that all the pains and hard work was worth it and just got the 2 nd one done.
Sending your way strength and energy!