I Feel really sad to hear things are not improving too, I am sad for you, your kitties and sad for Mr Magoo, my heart goes out to each of you.
You probably know in your heart, that it is time to return him, but you are sticking it out in hope that things will get better, and you no doubt feel awful at the thought of returning him, but you have to do what is best for you, hubby, the kitties and Mr Magoo, again as I have said before you have everyones support on PT no matter what you decide, Good luck., I sure can understand how fustrated you must feel, and torn between what to do and not to do, I really hope everything works out for you all.