Oh Boy. You had written this years ago. I hope you have found relief since. Please let me know if you have. I am convinced that what is happening to you is a result of root canal therapy in your teeth in combination with mercury fillings.
If you can take out a loan and 1. take a panoramic x-ray to see where you have root canals. If you can, take those teeth out and then replace all the fillings. I know it's expensive, but you can do it in another country for half the cost. Please write back at firstname.lastname@example.org and let me know how you do!