Your son painfully reminds me of myself in high school. Very ostracized, called names a lot.

Personally, I do not recommend the school counselor. My "guidance counselor" in high school was effectively a mouthpiece for telling the rest of the teaching staff my personal issues, mentioned in confidence to him. As Stephen Colbert once said, if school counselors knew what they were talking about, they wouldn't be school counselors. This is obviously a personal experience, but unless your school has a guidance counselor with outstanding qualifications, talking to them will likely be fruitless. Most won't deal with issues like bullying or fighting outside their office walls.

A psychologist might be a worthwhile idea, depending on his personal receptiveness to the idea. If he wants to go, enable him, but let him come to that conclusion on his own.

If I could speak with him, I'd tell him to simply have hope. High school feels like forever, but my post-secondary experience has been fantastic; suffering in high school has made me a better, more ambitious and determined person overall. There is hope at the end of the tunnel.