Hi happygirl,
I have an auto-immune disorder for you to check out..it is called pernicious anemia. You talk about unusual headaches, numbness in face, arm, etc. Are you tired all the time..no matter how much sleep you get?
Go to a website called: www.webmd.com or www.medicinenet.com and in the search box put: pernicious anemia...look at the info and see if it fits you. I know that you have had blood work done..but have them do a blood test called: vitamin B-12 cascade. You could be low on vitamin B-12 before you become anemic..that can give you these symptoms.
There is another test that a doctor can do..it is very simple ..it is called: Babinski Reflex...It is where a doctor will take a rod and stroke the bottom of your feet...there is a certain reaction that will happen if you have possible something bad happening in your brain. I will not tell you what the reaction is..so as not to influence the test, but if the doctor sees that it is a positive Babinski Reflex..he will get very serious and start running some tests..FAST!
GOOD LUCK...TAKE CARE..KEMOSABI..LET ME KNOW HOW YOU DO, OK?
If you have silver fillings google"Dental Amalgam Mercury syndrome"
If not I hope you find the answer
Cheers
Was the MRI of your brain or of your C-spine? If you have not had an MRI done on your C-spine, that might be a good direction to go in. I have the same pain in the base of my skull that goes up behind the ear and the arm pains. I've had ACDF with plates and screws at C5/6/7 and have some problems with C3/4. It sounds like there could be a problem somewhere in your neck.