I'm so sorry you're going thru this! It sounds so very frustrating.
This may sound extreme to you, but maybe you should give cutting out processed foods a try. Many people (up to 25% of the population) has a sensitivity to the free glutamic acid in processed foods and they don't even realize it.
If you've tried everything else, its worth a shot,right? There's more information on truthinlabeling.org if you'd like to do some research (or you can just wiki glutamic acid or MSG on wiki). Its mind just blow your mind.
Keep us posted on your progess, you are not alone! *hugs*