Yes, or you could say from. From sounds more formal. Yes. Not sure. Is it exchange (is the house literally going to be swapped in exchange for something other than money?) that you want here, or do you mean sell? Yes, although a little clunky. You could also say 'when will you be well again?' 'how much time do you need to recover?' What you say is absolutely fine, it just sounds a little odd to native ears.