Could high concentrations of electrolytes in the body stimulate ADD, autism, schizophrenia, or epilepsy?

Could high concentrations of electrolytes in the body stimulate ADD, autism, schizophrenia, and epilepsy in people sensitive to that? I wonder if such things, that seem like malfunctions in the electrical operation of the brain, might be triggered by something so simple as insufficient hydration or just excess electrolyte production. Are there any research physicians out there who could investigate that?

I suffer ADD from "thought storms" and my sister has a much more serious problem. I am testing hydration on myself, particularly when the thought storms are present, but testing yourself is notoriously unreliable.