mfpi baby with reflux issues

My daughter, Audrey, is now 4 months old. She has had terrible issues since 1 1/2 weeks old. She screamed and projectile vomitted, while writhing in pain for the first two months. We are now on an elimination diet and 30mg of Prevacid a day. It appears she is intolerant to at least dairy, egg, nut, beef, and pork. Some days are better than others. We have enjoyed some good times, and since we have begun working with a therapist, her development is catching up. She was having a hard time developing while coping with so much discomfort. We cosleep so we can all survive. She is extremely attached to me, particularly when she is tired. She is 4 months and does not sleep more than 1-3 hours at a time. We just began some probiotics this week and I think I am starting to see an improvement on her gas. She was waking around 3 or 4am and then squirming and passing explosive gas until about 6 or 7am. I don’t beleive her prevacid dose is working well enough. We recently tried a combination of prevacid and zantac, but that failed. She does not do well on the zantac and it doesn’t seem to do anythign for her. Last night she had her evenign dose around 7:30 pm and I broke down and gave her her morning dose at 2:30am–it was the only thing I could do to help her this morning (I did not notice the gas this morning however). I saw clear relief about 20 minutes after the medicine–this makes me think it was more reflux than food intolerance last night. I’m always guessing though. I’m tired, and frustrated. Any help would be appreciated.