First stomach bug 😭

My baby usually wakes up 4 times at night. Last night he woke up ONCE. He started to toss and turn at 6 so I was getting up to get him a bottle and he turned his head and projectile vomited all over! It was yellow so I called the doctor because he's never really puked before and while on the phone he puked again. 😭 I'm going to get him pedialyte when he wakes up. Anything else that will help him? It hurts my heart! 💔