hi. i just finished a ten hour shift at work (only 1/2 hour break), hot day - very tired. When I came home, unexpected visitor arrived - so went out for dinner and then to pub. I had drank about have a pint of beer and felt like burping - but could not. It felt like I was trying to burp a tennis ball. This only lasted about 2 seconds (at most), next thing I know I have fainted. I sat down for about 10 minutes and then went home to bed. Feel fine now - except for a sore head from hitting the wooden floor.