David - the same thing happened to me in Galway.
Except it started in 5th year and built up badly into 6th year.
The guy in question was the captain of the rugby team - asswipe!
He went into the army and then into the prison service.
That was 20 years ago.....
I started feeling symptoms of SA in 5th year which coloured

(this colour) every encounter with the opposite sex and some other people.
My confidence drained away and I became cannon fodder for the man above. I was just happy to leave school in the end but that experience and many others have left emotional scars.
All I can say to you as I approach 40 is that every person out there in their unique way has hurdles of some sort which hinder them and do you and I.
All you can do is stay true to what you are, who you are and what you want to be. The best therapy in getting past this hurdle is to say it out loud as you are doing and move on to the next stage of your life.