Hi Natascha...

I have two thoughts on this..being a fellow GERD person...

I belch a lot...it doesn't matter what I eat. It's a digestive issue...so I take enzymes with my meals. I'm lactose intolerant, and also have great difficulty digesting legumes, lesser difficulty with grain products and yeast...but still problems. You could be unable to digest a lot of what you're eating...and that can be extremely difficult when you're trying to follow a dietary plan. You already say "...found out Celiac" so it's possible there are other problems.

My other thought is...GERD sometimes leads to ulcers and hiatal hernias. The excessive belching and pressure leads me to think there might be a hernia involved...please check it out if you haven't already.

Peace...