Hi MominFl, I'm so sorry to read about your son's accident and what you are going through. I would suggest looking back at his medical records to see what his symtoms where in the first few month after his accident. Did he suffer from headaches, dizziness, nausea, problems concentrating and so on? Also, is he on any anti-seizure medications that could cause memory loss? It is probably not unusual for him to be angry about what happened to him. I hope you will find help for him.