Hello all,
how nice to meet fellow freaks!! I'm 27 and have definitely been like this my whole life - my mum even thinks i couldn't burp properly as a baby, which led to me getting repeated bouts of colic (gas build up in babies). Also, I was the unheard of small child who never liked fizzy drinks - embarassing at parties and at the time I didn't know why, but I think it's because I knew even then that they would make me uncomfortable.
I have never learnt to burp despite a younger sister who can burp the alphabet and tried to teach me for ages
The condition is worsening as I get older, and "Air Vomiting" is the only cure once the air is there. It's particularly awkward for me though because I used to be bulimic and so if my friends or family hear that noise they assume the worst...when it's only air!
However, having had this for so long I do have some tips which I find make things slightly more manageable. They are all based around not swallowing air into your stomach.
1) Never chew gum. It leads to a build up of saliva with every chew which you have to swallow into your stomach, with air and nothing else!!
2) Never drink through a straw. Once again, each sip carries air into your stomach. My findings are that the larger the mouthful of anything, be it food or drink, the less the air you take in and the less the bloat. So drink large mouthfuls from your glass (don't gulp - that' air again!) and eat good mouthfulls too.
3) Never drink fizzy drinks. I have never liked them, but when I've been bought them I've found it can take me up to an hour to finish a bottle of Smirnoff Ice etc because the bloat is immediate as I start sipping (bottles are not good either for the same reason as straws). Avoid at all costs! I even find sips of champagne at weddings hard!
4) I am a marathon runner and find running is brilliant for shaking up those gases inside you and getting them out the other end!! There's no way to be pleasant about this, but let's be honest - if we can't burp, farting is our saviour, isn't it?! And running really, really helps to do that. If you run outside when it's quiet, you can trump your heart out, no one will see or care and you'll feel wonderful!(Incidentally, you don't have to run marathons

I'd suggest 10-20 mins of jogging will have the desired effect.
5) I am a fruit addict but it doesn't help often. Not necessarily because it causes air in my stomach, but it causes gas the normal way, through the bowels, and that just adds to the problem. However, I find some fruits better than others - apples, pineapple, oranges are ok whereas plums, pears, nectarines, (most soft fruit) get your digestive gases going!
6) When you have to stick your fingers down your throat for the "Air Vom", and you're in a public loo which is busy and no likelihood of everyone leaving, wait until someone turns the handryers on. It's a few seconds of noise that will drown you out.
7) On the point above, several people have said they can't air vom after eating because they'll actually vomit food. This this isn't the case. Gas is much lighter than food, so everytime you stick your fingers down your throat, the first thing that will come up is the lightest, ie, air. You can get that pressure out without worrying about actually being sick.
Hope this has helped a bit - given that doctors think we're weird, making it up or just making a fuss about something trivial, the best we can do is help each other with tips on how to cope best. Maybe one day a sufferer will become a doctor - fingers crossed!