If its your only symptom an easy and effective way to stop the gas completely is to take charcoal tablets - believe me they work! Get 'activated charcoal' - its pretty cheap - take, say 6 at a go and it just absorbs the gas (take more/less depending on how it works for you!) - they use them in hospitals to absorbs poisons. And they really do work - quick and effective.
Another good way is by drinking fennel tea! You have to drink quite a lot depending on how bad it is - buy fennel tea - or the actual fennel seeds itself and pour boiling water, drink the water then chew and eat the seeds. Thats effective too.
The charcoal would be my port of call - but drink the fennel if you have to wait for it.