hi there, i am not sure if you have alreay tried this, but what about good ole fashion ginger.
i chop up ginger root, boil it, and pour it in my tea (with sugar and sometimes lemon). you can buy it at regular grocery stores.
ginger has been linked to help with upset bellys (hense ppl suggesting ginger ale when sick) etc. when i was pregnant, i was nausous (sp?) 25 hours a day.. i even felt it when i slept. there were certain commercials i couldnt watch becuz they made my stomach turn. and at the time ppl told me to each ginger snaps (made with real ginger) i didnt do the ginger root thing then becuz i didnt know about it. but i cant imagine it not having the same effect.. plus i would much rather try something natural then pills, especially during the first couple mnths.
they used to use it in the old days... and it also is a natural antiboitic (sp?).. i have been using it in my "sleepy time" tea lately at night with all the colds etc going around.. and so far everyone else has had a bad cold and i havent..
good luck!