Any info?

My baby was diagnosed with reflux at a month old. He tried Zantac which did not help and then was put on Prevacid. They told me it would not stop the vomitting but would ease the discomfort. We were blessed that it did both. He still spit up, but not nearly the quantity he was before. We have never increased his dose (1/2 a 15mg. tablet a day). He is now 8 months old. We have attempted to take him off twice to see what would happen. It is so hard to tell if it’s the lack of Prevacid causing discomfort or teething. When we put him back on the Prevacid he seems happier but spits up more. Does that make sense to anyone? Why would he spit up more on the medicine? He almost doesn’t spit up at all when he’s off the medicine, but seems unhappy. I am so discouraged. The pediatrician can’t give much advice beyond what we’ve done. Any suggestions?