S.B.
Oh my gosh, I somewhat know your pain since my 18 month old had acid reflux for the first 3 months of her life......that was the longest 3 months of MY life. When she came of age I did the Ferber method and it worked for her. The only reason she would cry through the night was because of teething. There is a possibility that your son is so used to being comforted during his acid reflux that it will take a long time to adjust to cold turkey. If he is NOT in pain then there is nothing wrong with cold turkeying at that age. I do have a friend whose child is 4 and she had to take the child to a sleep center!! It did seem to work. So there are solutions and I hope you find one soon....I understand!