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Can be severe viral infection --gastroenteritis.
You can try Pepto bismol liquid 30 ml every 6 hours and Loperamide ( Imodium) tablet 2 at a time every 6 hours to stop the symptoms.
Please drink liquids only, Gatorade, soup for example.
If no improvement in 72 hours, then this is more serious.
Can be bacterial infection, or acute gallbladder or pancreas inflammation --hospital evaluation will be needed.