Hey! It is really nice to see that you're taking such concern for your brother. He has you to help him; that's a plus.

Most of all your brother needs to believe that he does have hope. Feeling defeated or at the whim of his anxiety is a bad belief, especially for a young person. He can improve his lot if he works at it.

Suggest to your parents that your brother see a therapist. A therapist can teach him ways to change his thought patterns, reactions, cope with anxiety, etc. This are important lessons for any teen. It can take time to reduce anxiety. There's no magic bullet, not meds or a quick change in attitude. It takes work and patiance.