My rabbit has been having digestive issues which I went to the vet today for. He ate some food at 6pm pst, but is now suddenly getting cold to the touch. I have a thermometer but the batteries are dead. :c I am using a space heater and warm towel/warm water container to try and keep him warm until tommorow where he can see a vet. Should I try to feed him critical care, water, something? How can i get his body to stop shutting down? Thank you so much.