Dog fell and hurt himself

Yes i called our vet but they wont take him because their booked and emergency vets i been trying all day but one said they have to close cuz they got no vet and others said it 5 hours or longer wait so they cant take him and there no vet to look at his back. But My cavapoo was playing and he jumped and fell off the couch ( couch to floor is a very short fall and their is a rug on the floor ) on his back and yelled loud yesterday he has a little hunch back and wobbly back legs but he can walk but he his wobbly a little bit he can stand and he can wag and move his body but he does seem sore under his legs and you can pet him he doesn't scream unless he tries to jump which we been carrying him up and down stairs and making him rest until we can see someone but has anyone ever had this happen he's only 2 so he young and he small so im really nervous if we cant get him in till Monday what will happen. he hasnt gotten worse but still really worried because he did try running today when he got excited and he yelled ( I know no one a vet just hoping for advice ) please and thank you!!