please tell me it gets worse before it gets better

We started the gentle ease formala on Tuesday of this week. Started with 1 bottle on Tuesday. 2 on Wednesday Thursday and we will do 2 today. (Friday) After each feeding he is crying, trying to poop but can't, spitting up quite a bit, very clingy and just all together fussy. He has had 1 poop a day this week though. Also he drinks breastmilk most of the time . But we're trying to stop breastfeeding. Is it normal that he's acting this way? Is he possibly adjusting and if so how long does it normally take? I will add he also did the newborn powder for 3 days before. His Doctor said to switch to gentlease.