Girls, who have encountered such a problem. My son has been on mixed f…

Girls, who have encountered such a problem. My son has been on mixed feeding for half a month. He's very bad at sleeping, he's all twisted up, and his stomach hurts a lot (we apply Eспумизан Беби, Chamomile Simplex in feeding) it doesn't help!((( Yesterday I made a gastric tube drainage, you wouldn't believe it, it came out like a fountain, liquid flew out, we were both scared!((( Can you tell me how to proceed when this is sorted? I can't watch my son suffer ?? Thanks in advance