Talk to Pediatrician on Formula Feed

My baby is 2.5 months old and he is on formula feed completely. When he was 14 days old I changed his milk and he start doing loose motion I visited the doctor he changed his milk to lactose free and give me ezegut 5 drops with 2 drops of gripe water. I stopped ezegut and gripe water after 2 weeks. He was completely fine. I visited doctor again and he asked me to change his milk with combination of normal milk e.g, one feeder lactose free and one normal milk I did so but he start passing creamy stool then doctor advice me to give only one feeder of normal milk and rest all day use lactose free then he will see the results after 3-5 days. As this is my first chil I was very worried and I went to another doctor he advised me to give only one normal milk and I did that but now my baby is passing watery stools I informed the doctor he advised me to give low osmolar ORS with every motion. I am following his instructions but stool type is same. I am very worried please help me out to get out