Our expert says:
Some types of slime that grow in dams are associated with bacteria that can have negative health effects, including affecting the nervous system, liver and skin, so please consult your doctor about this. It may be helpful if you have sample of the dam water or a photo. Symptoms from drinking contaminated water may include headache and nausea among other complaints; contact with the water may cause skin rash and eye and ear irritation. Keep in mind though that the symptoms you describe are common and could have many possible causes.
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