Sick 9 Month Old....

My son is 9, almost 10 months old. Since last Sunday he has been sick. He started throwing up Sunday, and it had continued on. We’ve taken him into the doctors 3 times this past week, and on Thursday, his doctor said he had the stomach bug, and it hit him so hard because he’s never had it. And he also has tonsillitis, but doesn’t need antibiotics. He (knock on wood) is keeping clear fluids down, and some formula. But tonight he threw up his 4oz bottle of formula again. Any advice on what to do? And to help him, and myself....I’m just a worried mess, I just want him to be better. 😥😓