Im prob going to be unpopular for this but heres what worked for me.
I AM NOT RECOMMENDING IT AS IT CONTRADICTS SURGEONS RULES...
I accidently drank some sparkling water, Im a former Lighter Life person who used to consume 4-6 litres of sparkling water everyday pre-op. I was devastated when I learned I couldnt have it anymore, anyway - I grabbed a bottle of what I thought was still water from my car and was merrily drinking away - completely forgot I wasnt supposed to have it until the loudest barney gumble burp came from the origins of god knows where.
I realised that I'd been drinking sparkling, naughty naughty - however as the wind was my worst bit about the Op I continued and had a litre over a few hours - hey presto, that wind came up, and up and up.
For me that was it - wind gone. However as I said, im not recommending it, just sharing.