Thanks fellas, I've done the GP thing a few years ago, all due to having pain on a specific tooth and my dentist did not see anything wrong. The pain was horrendous and my GP referred me to the hospital maxillofacial unit, long story short, the tooth was dying and they eventually extracted the tooth for me.
I reckon the same thing is happening, I used to grind my teeth a lot, and now with my teeth clashing together just puts my teeth at more risk of trauma/getting damaged and dying.
Dentist's cant diagnose a dying tooth, not unless it has decay or an infection/abscess, this can take months even years, meanwhile the patient is left in pain.