Relief from acid reflux when lying down

I’m just posting this because I’m curious about things that happen to me when I have acid reflux. It is mostly a feeling of tightness in my chest, as well as feeling sick. However, it is not nausea, just a feeling that I am going to throw up which worsens when talking or partaking in physical activity. When lying down flat on my back, I feel much better and less as if I am going to vomit. Why might this be?

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u/Physical-Boss-9929 — 2 months ago