Any doctor out there specialise or have very good understanding of guillian barre symdrome?

I don't know but:: I hope you find someone here but this is a rare condition so few doctors have seen many cases. But here's a good overview of both conventional and natural therapies: https://draxe.com/health/guillain-barre-syndrome/ Because conventional treatments have limited benefits you might also consider acupuncture and homeopathy (with a professional homeopath): https://www.askdrshah.com/guillain-barre.asp

Sure. Look online.: Years ago, listings were available only in printed form. By the turn of the century, lists had become available online everywhere. Now, some lists are only online, and no longer printed. County medical societies (or other medical societies), hospitals, and insurance companies usually list doctors by name, group, insurance plans, and location. Look online under Neurology and Infectious Diseases.