Sounds like what my DD was doing. She was diagnosed with silent reflux. We took her to the homeopath and got some drops. Completely different child.

Now just recently, 3 months later, she has horrid constipation and is turning into a chucker.

Homeopath suspects a dairy intolerance so now we are on soy formula. Oh and we are on the newborn teat still otherwise milk spills out everywhere and she splutters and chokes on it.