Sorry you have no definitive answers, Alberta. I find that can be the case with non-commital Neuros.
I am afraid I have no answer to what he means by 'irritated brain', although I do have a good link for Central Sensitization. I am stuck on my phone, let me see if I can find it.
Dave.
Here's the Link
http://www.instituteforchronicpain.o...-sensitization