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Yes, alcohol can make IBS worse, either acutely or chronically. Alcohol can be a trigger for some people, so may have an acute exacerbation of IBS related to drinking alcohol. In addition, chronic alcohol use can cause problems with anxiety and this can cause the IBS to be worse chronically, and some of this chronic effect of alcohol on anxiety will persist even after the alcohol is no longer in the body.
If I can provide any clarification, please let me know.
Yes, it is generally OK to drink a small amount of alcohol once a week.
If you find that any food precipitates IBS symptoms, it would be reasonable to avoid that food, but this varies so much from one individual to another, you just need to find the foods to which you are sensitive.
You are now asking a different question that is unrelated to the effect of alcohol on IBS. According to the rules of JustAnswer, You need to post separate questions in a new thread.