ASAP HELP!

Mariah • Wife❤ Mommy of a boy❤
My son is almost 5 months old (March 5th), he won't drink formula, he literally screams and crys every time we feed him. And he eating/drinking less than he use too. He use to do 6oz now if he will eat he will only do 3-4oz. I gave him pedialyte tonight to keep him hydrated. What should I do? Any insight on what could be wrong? I'm going to call the doctor later.