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Mebeverine is for the stomach and it will not do affect your anxiety.
I think that your symptoms are related to anxiety and I would have prescribed something like escitalopram or citalopram to help with your symptoms i.e. to reduce your anxiety which would have most likely also resulted in improvement of your stomach symptoms.
Your situation can improve on its own in a few weeks but if your symptoms continue I would strongly recommend that you be referred to a psychiatrist.
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