My mini schnauzer is sick?

I have a 8 year old male miniature schnauzer. On Sunday, he got into a rabbits nest and ate a baby rabbit. He was acting fine on sunday, monday, and tuesday. Yesterday when i came home from school he had had diarrhea. Today, I stayed home from school and he had diarrhea 4 times and threw up 5 times ( once was it was orange the other times it was just flem). Now he is acting really weird. he wont drink his water, he is walking around the house very slowly, and he shakes sometimes. My mother told me to give him some pepto bismol and that seemed to stop the vomiting, but i am still worried about him . Should he be brought to the vet?