Es, you sound very positive and focussed, well done!
I would think Nick's added confusion is down to the infection, and change of routine, and it will hopefully improve as time goes on.
I know what you mean about the care home, then home to you, then respite being too much, but could the home where he is going for respite take him from hospital? Especially if his discharge is delayed for any reason. Though I can see you might think that's too long.
Hope you are sleeping well?
One week down with the building work, and what a week, but you are doing really well by the sound of it, so rest up tomorrow if you can, ready for week two.
Thinking of you both,
sleepless x