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Hi this is Dr Stan and I will help you today. Having a stomach flu can dehydrate you easily. If you are having weakness but little or no leg pain, the weakness is most likely being caused by dehydration. Lose of potassium is part of frequent bowel movements and bananas will help replenish potassium. Also increaseyour fluid intake and the weakness should resolve. I hope this has been helpful and I am here to answer any additional questions you may have.
How are you feeling?