Hello.he will require a detailed evaluation. Symptoms described by you looks more of a depression. But a psychiatrist needs to talk to the patient himself n there are various queries and questions the psychiatrist need to ask to the patient. He should be fine once he consults a psychiatrist.

Hello miss. #  Since the problem has started for last 1     week . It means all symptoms are acute in     onset. # One thing is important to consider in acute    onset any recent :                          a.  Stressors (like , exams , job insecurity ,                  parent being hostile towards him,                  Love failure etc.                                    b.  Precipitating factors ( undesirable                 event that happened suddenly                 prematurely / unexpectedly ).      c. Any organic Brian injury or damage.      d. Any Substance use /abuse / withdrawal.      e. Acute panic attack ---  If the duration is more than 1 week and      symptoms are persistent / episodic and      causing impairment in personal, social and      professional life than , we have to rule out      minimum 3 possibilities :                             ** Anxiety Spectrum disorders.                    ** Personality disorders                            ** OCD spectrum disorder. --- One thing you might have understood by      now it's not easy to predict the actual illness      of your brother based on above symptoms. --- Psychiatric illness require detailed     conversation with patient ( most     importantly ) and then care taker. Either of     conversation is incomplete without the other     one . And finally mental state examination is     done solely upon patient to see cross     sectionally the ongoing illness. Without all of     these it will be wrong to diagnose and     proceed. --- Don't be in tension ,maybe he has no illnesses      but that can be confirmed only after      Psychiatric consultation. No other heath      professionals can do justice to it .

Pls consult an expert soon. I would suggest you consult a psychologist or psychotherapist and dont straight away het into medication

Need to be evaluated

From the symptoms you have mentioned your brother seems to be suffering from mixed anxiety depression.