My son who is 33 had a closed head injury at 18 years old. He was doing good except for short term memory and some impulsiveness. Lately he told me he was having scaring, racing thoughts and has started as if he is arguing with the thoughts. He doesnt talk out loud to them but has the gestures as if talking to them. I tell him they arent real and he says, I know mom. Im scared for him.
Reclothe symptoms of your son can.be due to two things going together - he. Needs an MRI Brain and EEG and if there is anything neurological then start anti-epileptics. Along with that - for his racing random and irrelevant provoking thought he should be given an antipsychotic like-olanzapine 2.5- 5 mg at night. Get his blood tests - liver and kidney tests, lipid profile and sugar levels. He will get better with meds but the Chat Doctor.  Stay in touch with both his neurologist and psychiatrist regularly. He will be fine, his presentation is quite a common one.