Girls, help me.? I don't know what to do anymore. The baby is not drin…

Girls, help me.? I don't know what to do anymore. The baby is not drinking milk at all. He cries, throws up, and chokes. We have changed so many bottles. Nothing has changed. We even changed the formula. We are 3 months old now. Now he started dissolving cookies in milk and giving it to him, he drinks it with pleasure. But I can't give him a cookie every feeding. Once a day only. The rest of the feedings are difficult. I only feed him in a crib (in a cradle, covered with a blanket) and then he gets fussy and cries. It's impossible to feed him freely lying down or in a sling. Sometimes it's impossible