You have reduced the iv fluids to output + insensible losses.
You have started a bolus of iv furosemide.
You have decided to half correct the acidosis with sodium bicarbonate and treat the hyperkalaemia.
You have decided to wait until the hyperkalaemnia is under control before giving any blood.
Decide how much bicarbonate to give and what to do to to bring the serum [K+] down.