I had the similar symptoms! But unlike you I suffered for the last 7 months only. God helped me and He will help you too.
What I did are as follows:
1) I had two root canalled teeth and I got rid of them because they contain toxic bacteria which lives in your dead tooth and causes neurotoxicity.
2) I had my silver amalgam feelings as they contain 50% of mercury which is an extreme neurotoxin! But go to a dentist who follow IAOMT standard for removing amalgams.
3) I avoid foods with MSG (monosodium glutamate)! 90% of the packaged foods in super market contain MSG
I did these after huge internet studies and failing three four specialist doctors and lot of tests e.g. CT scan, nerve conduction test, blood tests etc. I suggest you go to Utube and search for "root canal danger" google video for "poision in your mouth" and Utube for "MSG danger" and you'll get the idea!!
I am quite normal now but within last 3 months I had been hospitalized 3 times. God bless you.
I had four (4) teeth that were bad taken out of my mouth. My inflammation level went from 91 to 60 in two months. 60 is still not normal but as least it's better than 91.
HARA - Now if my neck pain and headache pain would go away that would be nice.