Constantly spitting up

As

My 2 month old was switched to nutrimagen(sp?) about a week ago for constipation issues. Now he’s constantly spitting up. It sometimes comes out of his nose but he soaks his clothes everytime. He only eats like 4 oz every 2 hours and we burp him every oz. He gets upset everytime we burp him too. I’ll call the doctor tomorrow but was wondering if any other moms have had this issue and what helped their LO