Garlic can be irritating to the digestive system if you eat too much or eat it on an empty stomach. I limit myself to just one clove at the end of a meal. I cut it into small pieces, chew it well, then swallow each piece with plenty of water.

It sounds like you might get some relief from ginger,clove, and cinnamon. While the antifungal effects of these may cause a die off reaction, they are said to be good for calming digestive disorders.

http://www.herbwisdom.com/herb-ginger-root.html
http://www.herbwisdom.com/herb-cinnamon.html
http://www.ageless.co.za/herb-cloves.htm

I just read that clove oil can be toxic in large quantities. I don't know about the powdered clove, but to be safe I will cut back on my clove consumption.