Hello, Occasionally And This Has Happened For Years I Get

Hello, occasionally and this has happened for years I get hard hiccups usually when I am eating I have found that they go away if I drink something. But now they seem to be getting worst; it feels like I can't swallow or that I have to burp but nothing comes up. I end up choking or coughing and vomit up lots of foam? I am going to have a upper and lower GI soon but was wondering what medical conditions would cause this type of symptom?