Ask your doctor for some medication to prevent nausea. You need the pain medications but there is no need to feel nauseated.
Are you taking Lasix for a heart condition, or is it just to try to reduce swelling. If it's just for your leg swelling, I think you should ask to stop taking it.
I had a revision from a partial to a total and for me it was no harder than my original recovery. I think that your anaemia is probably contributing to your general feeling of being unwell. Ask your own doctor if you can have a blood test, to determine if you need to be taking iron supplements.
You should still be spending most of your time resting if you can, especially as you still feel weak.
Can you postpone moving? Doing it in a month's time is asking a great deal of yourself and of your knee. In a month's time, you will probably not be strong enough to contribute much physical work towards the move.