4 years ago I started having weak ache's, bloating on my right side, it feels hard. I always have had chronic belching after eating like I am not digesting overly great, though most of the time, I don't have a vomitting attack unless I get glutton and over eat something like pizza, meatball in spagetti or liquor/wine. Matter of fact, over indulging in the sauce has caused 2/3 of my "gallbladder" attacks to date lol with the other happening 2 weeks ago, fatty meatballs in spagetti.
Typically I just start exercising to lose weight and east a can of whole beets over a period, and it gets signifigently better. Though, your condition sounds more advanced than mine, better get it checked with some different tests.