I think I have a jawbone cavitation, I am in agony everyday. What can I do?

You poor person! I feel so bad for you. I can't tell from the story if you have had the teeth pulled or not. Have you? That might be part of the problem. If you have had the teeth pulled, you may have a jaw infection or some damage was done to the nerves when the teeth were pulled. Have you tried going to a medical doctor and not a dentist? Try to find one that specializes in chronic pain. I don't live in England, I live in the States, so I don't know how your medical system works there. But I would find a medical doctor that specializes in pain and demand that a MRI be done to see if they can find something that could be causing this pain. I wish I could be more help. Chronic pain is not fun and can be very depressing. I wish you the best.