I have suffered about 3 months with some gastro problems being investigated by doctor and hospital. I have lost about 25 lbs. Was hospitalized once during this for dehydration as out-patient and IV potassium received. I am showing dehydration symptoms again and never had dandruff till 3 - 4 weeks ago. I am using a dandruff shampoo. Can this be due to dehydration or lack of a mineral/vitamin or both.