Hugs! Did you speak with Dr Weinberg, or just review the web site? If you didn't touch base, you should at least email him. He could be planning to be out of town, and you don't want to be counting on him always available. I have been able to have him come out with as little as an hours notice, but one time I called him in the evening and he was on the road, about six hours away.
Another 24 hour option if your vet isn't available (but you have to take the dog there) is Northstar Animal hospital right off 195 at exit 7.
Not sure where you are. I'm in Howell, so it's an easy trip. They have a private room for folks to sit with their pet. It has a rug and couches, so it looks like a lounge, not an exam room. It even has a private exit so you don't have to go back through the lobby.
Hope you can enjoy the time you have left, and make it special! This sucks, but our dogs count on us to help them out of their pain. It is Sooo hard, but we are here for you. Hugs again!