To me is sounds like Silent reflux, with the throwing up and swallowing red face, and it is horrible because unless the baby is phsycally thowing up the milk and out it can be undiagnosed. And it hurts as an adult so you can only imagine how painful it is for a baby, and they do come on and off again because the milk helps soothe, but unfortuately it creats a viscious cycle, and if it isn't reated it can lead to a raft of issues

DD has reflux, but it came on quickly and violent, to the point where she was chockin on her milk in her sleep, I literally had to sleep with he sitting upright until we had our Paed appointment, and she even began choking on her milk upright. She would literally scream the house down, read face, and very painful cry, and not be satisifed by the breast or anything else. We explained it all to our Paed who put her on Losec and very quickly we had a completely different baby, she was settled and much much happier, she is still throwing up, but it isn't hurting because the acids have been neutralized. But she is on an adult dosage , morning and night, because the 10mg once a day didn't last her all day, we are only just getting through the 12 hours with that dosage. We have Infant Gaviscon to use as well which should help with the vomiting, but I have tried it a couple of times but it didn't make much of a difference.

DD's basinett is also propped up on two towels so she isn't flat.

When she is screaming is she arching her back and more stretched out, rather then bringing her legs up to the front? TBH 7 hours seems like a lot for it to be a mix up of day and night.

Please seek an alternative opinion and when you speak with the Paeds, they can often get you in quicker, explain everything and how bad it is.

Big big big to you hun and I so hope things start to improve for you xxoo