I posted about this a couple of months ago.
Near the end of May my 6 year old started being sick every 3-4 days. It gradually increased until it was 2-4 times a day in the middle of July. He was admitted to hospital in the last week before the school holidays and had an MRI scan which came back normal for him, just the mild brain abnormalities he's had since he was born. He also had bloods taken which showed he was a bit anaemic.
When the summer holidays started I started giving him food little and often which seems to have helped a bit. He is now being sick every 3-4 days. He's got an appointment with the paediatrician but that's not until 16th September. It's very similar to when my now 8 year old had reflux as a baby but can a 6 year old get that after not having reflux as a baby?