Please help with sick dog?

I have a 6 month old lhasa-poo who just got sick over the weekend. Sunday evening I noticed he was not eating and vomited a couple times. Thought it might have been a day bug but it is now Tues and he is still not eating and keeps vomiting a yellowish substance. He barely drinks any water and will not eat his food or treats, which is rare since I call him a mini garbage disposal. Also, he is shaking as if he is cold more than usual however he still runs around and wags his tail, just not as often as he used to. I am without my car until the end of the week so I have no way of getting to the vet, in the mean time does anyone have any suggestions on what to do with him as far as feeding, treating? I tried forcing water and chicken broth down his throat so he can have some substance in him but he ends up throwing it up a couple hours later. Please help, thanks in advance.