What Causes Pain, Appetite And Digestion Problems?

Toddler seems to have pain at night and is inconsolable. Has had eating issues, still on formula and not much in the way of solid food. Did swallow study (she aspirates, upper GI (showed reflux but otherwise everything normal), slow gastric emptying test (digesting food properly). had a scope (everything working normal), had celiac test at 6 months(no issues), allergy tests (showed nothing). She is showing signs of pain, waking up a few times in the night and will cry for up to an hour. Doctors can t seem to find any issues.