Iona-sorry to hear that but at least you have an answer.

I was told silent reflux and colic have similar symptoms when they start to drink they arch their back and scream suck for a bit more and do the same they pull their legs up and throw their head back and when they burp and bring up milk it comes up with digestive juices from the belly and burns ther esophogus they are hard to feed and settle.
I was thinking Ella might have had it but she has settled down a lot with the change in formula still not 100% but a lot better.