Although this sounds very much like a neurological, rather than psychological, problem, there is something you could do that might clarify things better. Since he has had so many stressful events recently, the anxiety and stress may be contributing to the severity of the symptoms, making the exact diagnosis and treatment more difficult.
Therefore ask for an extended consultation ( 3-5 visits) by a psychiatrist who will fully explore and talk to your brother about the stress events and see if that short intervention actually changes his symptoms. That will give you and the neurologists some important information about how to proceed.
Please i need how to evaluate this problem ( may be tests)& what therapies i should adopt. We already had psychiatric sessions but to no use. Is there any neural regeneration possible in this case & how. Plz. help me out.
have a nice day