reflux back?

Hi! I haven’t posted in a long while. Ryder my youngest was a reflux babe and was on Zantac and Prevacid until around 9 months. Since then he had been fine. For two weeks now he has had some loose (not diarrhea) just not his norm bowels and lots of night wakings, crying and gas. I thought it might be something and called last Wed they had me put him on cullterell (probiotics). It hasn’t really done anything. He is not a big milk drinker but does do minute maid kids could that be causing issues? Only other thing I give him is water and whole milk. He weaned completely from breastfeeding at 14 months. He will be 16 months on the 19th.