Hi welcome to H.C.M.Forum. did you consult any doctor for this reason. who told you that water is coming from the brain. there is a simple test to know whether water is from the nose or brain. keep a karchief near the nose & let it wet. if cloth is stcky it is from nose. if it is watery it is from brain. as it is sticky it should be from the nose. in my openion it is due to allergy
in your food. may be to oil, cereals, vegetables, or sea foods. or some thing else. or due to sinusitis
if you are having headache other times.
i advise you to consult an ENTsurgeon for diagnosis. you may need to take CTScan with routine tests for confermation. wishing for smooth recovery .