So I brought him home, with a bag of fluids, a ton of food for anorexic pets, and meds (anti-nausea, one for his liver, appetite stimulator, and a antibiotic), I can hardly give him any of these things alone - he´s just too big, and fights too much - but i´ve been buying friends beer for helping me out everyday. The good news is that for the last few days, he´s been eating his regular hard food on his own. Not much, but some. He doesn´t drink, but I´ve been giving him a good amount of liquid with the daily IV - so I guess his disinterest in water is understandable.
When I run out of fluids, sometime mid-week, I´m hoping he´ll start drinking on his own again. He´s still very lethargic, but he is doing some of his normal activities - bird watching out the window, scratching his post, and such... and he´s been acting more affectionate, which I think is good. Still no idea what caused him to stop eating in the first place, or if he´s getting better - will have to wait and see.
And thank you for the concern - it is much appreciated.