Dog emergency!!!!!!!!!!?

I have a nine year old cockapoo and he was fine yesterday but i just went to walk him today and he was very lethargic. We only made it across the street when he started to twitch when he peed. i decided to turn around and when we were crossing the street he just stopped. I picked him uo and carried him back and when i put him down he started yelping in pain. he's shaking really bad and tenses up when he walks but i just finally got him to lay down. i don't have enough money to take him to the emergency room but i am taking him to the vet tomorrow morning. My question is is there anything i can do? it's horrible to watch him in pain and know that i can't do anything. Dose anyone know what it is? Do you think he'll make it to tomorrow morning? any advice will be helpful, thanks in advance.