Hi, My 9 Year Of Chocolate Male Labrador Early This

Hi, my 9 year of Chocolate male Labrador early this evening began shaking and excessively drooling. I took him for a short walk and he urinated and deficated which both were normal. Then he began wanting to eat the tall sweet grass, so obviously his stomach was bothering him. He did not want to go inside, and with 10 minutes or so he began to have diarrhea. Once back inside, I gave him one chewable Pepto Bismal tablet. Within 30 minutes he vomited several times. Since all of this, he is just laying down, shaking/trembling, breathing hard and excessively drooling. Is there anything I can do for him tonight?