What Causes Vomiting And Mild Stomach Pain Along With Cold Chills?

Monday nite he ate some chili with turkey meat sub for hamburger and new food started Monday also prescribed by vet (z/d) threw-up mon.nite walkink slow in pain and ate alittle today &drank water. 70 pounds seems to be little better, mon.nite he has the shivers like he was cold. could he have a cold & how do I treat