Yeah I was going to suggest Neocate or an elemental formula. My daughter was the same, it wasnt a lactose intolerance it was just too hard for her to process. We had her on goats milk formula and that was very good.

Also you can buy thickener to help keep the liquid in the tummy rather than up the throat, this helped our DD alot as her was silent reflux. We had our daughter on Zantac liquid as after trying Losec found it didnt do a great deal for her.

Lots of options, I hope you get it sorted soon.xx