Hello! I am new here, too. :)
I know exactly the feeling you're talking abouit, though it's hard to describe. It's like a numbness inside the head...sort of. I get lightheadedness/dizziness, but I don't get headaches, really. I had an MRI and the ol' noodle is just fine, though I did get whiplash from a minor car accident last Sept. and that's when my anxiety started.
I wish you luck in overcoming your anxiety, my friend!