LO is 9 months old and was put on Zantac for reflux a few days ago. She is still spitting up A LOT, including solid food. And in 3 months she had dropped from 61% in weight to 40%.

Last night she was up and down all night, which is highly unusual. She normally sleeps through the night. She was just standing in her crib screaming. I rocked her, changed her, brought her to bed with us. As long as I was holding her she was fine, but wide awake. I ended up just putting her in her crib after 2 hours with toys. She cried for 15 ish minutes until she feel asleep and kept waking up and repeating the cycle.

Any clue what else it could be? Her top gums were a little swollen yesterday, but she didn't have this much trouble when her bottom teeth were coming in. No fever.

Any ideas?