Please help....idk whats wrong with my dog!!?

Unable to make a diagnosis over the Internet, only your vet can tell you what is wrong. It's too bad your vet couldn't do the tests yesterday, I wonder why... I would leave him in his blanket, maybe try to feed him some of his favorite food, and a little water NO milk. You could try a little boiled hamburger or chicken in very small amounts. Don't make him walk unless he wants to. It will be difficult but try to keep him comfortable until it's time to leave to see the vet. Wish you and your baby the best.