yes, it will come on quick. so glad they did the x-rays right off the bat.
cool and calm will keep him comfy. not cold like on your Avatar. Bet the poor fella's gunky breathing. relax and keep him company. He'll like that, and keep us posted.
Oh, gosh. The advice above is great. If his appetite is going down, try tempting him with can food, cooked chicken/rice, that sort of thing. I am the crazy food lady around here and I cajole mine into eating. lol
Is he breathing well? If not you can take him to take hot shower with you. Meaning that he is in the bathroom with you breathing the steam. That helps.