Ok I need help! My son started on Similac advance (supplemented) but I noticed he was not…

Ok I need help! My son started on Similac advance (supplemented) but I noticed he was not pooping...so we changed to pro sensitive and same thing...So I had some sample Enfamil gentle ease and it worked perfect for him. I informed his ped. About it and they said Similac total comfort was the equivalent to gentle ease. So he's been on total comfort for a week now and now he has started throwing up curded milk. I'm going to make an appt for him in the morning (he might have kept down 6 oz within the last 2 days) and he's becoming more fussy at night. He will not fall asleep with daddy...he will fight all night (till bout 3-4am) until I get him. And immediately as soon as he's in my hands he is comatose. The scream he has with daddy sounds like daddy is hurting him and the only thing daddy does is hold him...and it's only at night. Throughout the day he loves his daddy!