Diabetes and cushings.

Doc, I need an objective viewpoint. My 14 yr 3mo old dog Buddy has been diagnosed 3 days ago with diabetes and Cushings. My vet says the treatment is expensive and snsure to regulate his blood sugar. Also has an infection, treating with Orabax.We cant seem to decide to try the insulin or not, as he will not eat ANYTHING. I know about insulin and trilostane, but he will not eat at all,not a bite, nothing, no a bite for 4 days not even homecooked best-of-his-faves. Drinks all the time, wobbly, no energy, still pees outside.I adore him, but he seems to have no quality of lie and he is 98 in human years. he does not seem to be in pain, but he is going blind and has no joyful activities. I am afraid, without eating, if I start him on insulin I will kill him with it.I want to make a compassionate choice but my spouse is leaving it up to me. I hold him, pet him, rock him all he does on his own is lay oI know dos can go without eating fr up to a week, my vet says, and he was overweight b4. Now he just lays on his bed. I think he is in ketoacidisis. Do I force feed him a liquid syringe food?then do insulin? I have to leave town in a week and I must be responsible, if he is going to die I dont want to leave him to suffer or have him stay at the vet for a week to die while I am gone. My spouse is worried about the $ and says he is really old anyway, let him go, but then he changes his mind. OF course he would not be giving him injections or meds. If it was just diabetes, maybe, but with cushings too? Looks too uncertain and too much $$ for us. Help!

Thanks for your help. Yes, this is very hard. I'd probably be willing to spend the money, but my spouse is not. He says if Buddy were 9 it would e different so here is my last question: Is 14 really an old, long life for a (was, but now 22 or so) 25 lb dog? If he were healthy,or if we got him that way, how much more time would he have had anyway?Thanks again.

Thank you for your help, Dr. Marie. I made the compassionate decision and Buddy went to sleep in my arms last night. It was so peaceful and I held, petted, snuggled and talked to him for an hour beforehand, in a special very comfy room at the vet hospital, just for last moments. He went in my very arms, looking into my eyes, as I scratched his ears and neck as he liked it done. He was so peaceful and out of pain. It was so the right thing to do, not for me, but for HIM. I wouldn't have had the guilt-free guts to do it without you. Thanks again.