Distemper gets on my nerves!

Is it true that all dogs go to heaven? I hope so. Our Mischka has been sick for over a week now. He was brought to the vet last week and was diagnosed with distemper :( He was given a spine tap (?) which, they say, is the best remedy (sort of) for that. The vet said we should see results in a week. IF Mischka gets better after a week, then he's on his way to recovery BUT IF NOT, then it's goodbye :( I've seen this sickness on many dogs and knew it was fatal.  I scoured the internet in hopes of disproving my thoughts but was unsuccessful :( He has no appetite and couldn't walk steadily. It's like his rear legs just don't want to get up. Hope sparks whenever there's someone at the door and he suddenly lifts his head and barks...but when he tries to stand up, he stumbles and falls.  He totally doesn't like his dog food anymore. Move on to liver which I cooked with pepper and amino. He loved it for a day but then stopped eating it again.  He'd sit beside us on the dinner table and I'd give him my food.  Last night he liked the fried chicken we were having so I gave him half of my share.  The pizza crust and bread, he didn't like. He doesn't even drink water anymore so this I have to force feed with a syringe.  His eyes are full of gunk that I gently wipe away with a wet tissue.  I talk to him as if he understands.  I can't help but cry whenever I see him and that throbbing head, very common in dogs that have distemper.  I was mad at myself for getting another pet dog again, knowing they don't live that long even if they just die of old age.  Should've gotten a parrot or a turtle!  I heard they live way longer than us humans.  I cannot have this right now!!! It's just way too depressing :(