Worry & Tired

I'm worrying every second, every minute, and every hour! Worrying about Daniel. He was sick last 2 days. Vomiting and diarrhea. And now, he doesn't wants to drink milk! I changed his milk for 2 times. Enfalac A+ and Smilac LF. He push away the bottle when I give Enfalac but he drinks Similac. Does this mean he like Similac? So tiring, everyday have to force him to drink. What should I do???? :(