What I can do?

Hi, Good afternoon! I have a problem with my dog ​​and I wonder if any of you have been through this and can give me some advice. 

Last Friday (October 3) my dog ​​and I were hit by a car while we were walking. My dog ​​took a big hit and was dragged by the car for several meters. That same day I took my dog ​​to the emergency veterinary clinic in my town. Once there, the vet asked several tests and x-rays and told me that (considering the blow) my dog ​​was fine but that he had to immobilize one of his hind legs because it has a crack in the bone, also told me to give him lornoxicam 16 mg 1 pill / day. On 7 October, I noticed that my dog was strange and had the dog rib pain, so I went back out to the vet, he told me that my dog ​​was fine, the only thing my dog has is a contusion.

Today I found my dog ​​vomits a lot. I do not know what to do because the emergency veterinary clinic is closed and will not open until tomorrow. I wonder if any of you could help me or give me some advice about it. 

Thanks a lot!