Tension caused by stress and anxiety can build up in our jaws. Each person is different, some people get tension like a tight band around their heads, others in their neck and shoulders. But the jaw is definitely one of the places where tension builds up. And these tense muscles could easily start tingling after a while, especially if you've been tense while asleep or grinding your teeth.
Do you know any relaxation exercises - like tensing each muscle group, then relaxing them? You could try that or anything else that helps you to unwind. I find the best thing is not to think about it too much, distract youself with something else if you can. You're right about the worrying - the more you worry and stress the more your body is going to get tense and produce more sensations.
You are normal! Your body is doing what it should be! Our fight or flight stress response is a normal bodily reaction, it's just when we have an anxiety disorder we're telling our body to trigger this response at the wrong time.
I know it's easy for me to say this and quite another thing to believe it when you're anxious but I hope I've helped a bit. I used to have agoraphobia but my anxiety was focused around my health - I used to be on red alert for every 'new' symptom, it was a nightmare but somehow I've managed to overcome it.