Natural herbs such as the happy camper mix???

Ive been taking happy camper to relieve stess and anxiety.Its been working well until recently i have developed IBS like symptoms.I called the company Natural Balance and they said to stop using it for a while but didnt have any info if caused or is related to the IBS.Ive tried st johns wort and 5htp mixtures but i was told there really for depression.Does anyone have info on a natural herb or compound that is easy on digestion????? Happy camper is good but does have Kava Kava in it and this concerns me,
from what i have read on the web realating to Kava Kava.Any help would be welcomed.
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