Have no idea...but I would recommend Mint tea for anyone who is feeling a bit nauseous or has a dicky tummy, (or and I hasten to add trapped wind!!.) I find that it does the trick, admitedly it is an aquired taste and looks like pond water....but I've grown to like it and often drink it instead of, my usual cuppa..
If it's a psychological thing it works for me....camomile tea however is a different story...it's sposed to help you sleep!!! but quite frankly I'd rather knock myself out that drink it because it's sooo vile...