The toxins left in the blood & not cleared by the kidneys can poison the brain. It's not unusual for dialysis patients to develop these sorts of impatient & aggressive behaviors. He might need to have his diasylate adjusted. Let his nephrologist know. " Uremic toxins are defined as substances, organic or inorganic, that accumulate in the body fluids of subjects with acute or chronic kidney disease and impaired kidney function. They collectively contribute to the diverse clinical manifestations of the uremic syndrome." & this "Patients with uremia typically complain of nausea, vomiting, fatigue, anorexia, weight loss, muscle cramps, pruritus, or changes in mental status. The clinical presentation of uremia can be explained by the metabolic disturbances associated with the condition." My thoughts are with you both. <3