What exactly is acid reflux? Is it caused by weight gain?

I think that I have acid reflux but I'm not sure. I've never had this before. It seems to get worse the more weight I gain. Not to be gross but I seem to burp pieces of food up. It's acidy but not like when you vomit nor does it burn it just tastes real bad. Is that acid reflux? I also heard that it was irritated by weight gain. Is that true? It seems like most any food irritates it. Also I was told that I may have to have some kind of test done pre-op. Does anyone know what that intails? Last question will this surgery help acid reflux? Thanks for your help

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