You can choose from a number of Veteran Service Officers affiliated with organizations like American Legion, Veteran of Foreign Wars, Disabled American Veterans. I have been successfully represented by the DAV. Do not attempt to submit claims to the VA yourself. Let a VSO represent you. They know how to deal with the VA.You are a babe in the woods without a map. Get help, that's what they are there for. Good luck.
This definitely sounds like a case of discrimination, as I posted here.
I would like to know more information and updates on your story.