A psychotic state often found with alcoholism, dementia and depression. Obsessional suspicion and aggression. Morbid jealousy. Such symptoms are often of physical causation and will not improve until the condition is remedied. Consider low thyroid function (Kelp), drug dependency (Valerian), auto-toxaemia (Echinacea).
Even as too low body fluids may kindle emotions of anger and irritability, so too much water has a depressing effect, bringing about an emotional state simulating paranoia. Administration of a timely diuretic (Parsley or Juniper berry tea) is sometimes known to raise the spirits.