Hi LTww,
This is a great forum and full of information and support. As we're not doctors, obviously we cannot diagnose your situation. That being said, what you described does not present itself like OC. And yes, your age and stated lifestyle supports it. There are always exceptions to the rule but they're few and far between.
The system in the UK is different and as you've been to A&E and your doctors, been tested etc., it's a positive sign that they're not concerned. You're having some oral health issues but they're not presenting themselves as typically OC would.
Being that you stated your HA issue, what you're describing definitely lines up with anxiety symptoms. The jaw, neck and ear pain is synonymous with TMJ.
Truly, you are your own best advocate but you can be your own worst enemy too. Be persistent but also understand that after tests and several professional medical opinions, you may be just fine

Good Luck!