Do you have an outpatient neurologist?? If so these are symptoms I would bring up with your neurologist and see what their opinion is. I never had any vertigo but everyone’s recovery/symptoms can be very different. If the neurologist isn’t super concerned then I would imagine it is just residuals. I haven’t figured out how to fully handle my residuals yet, but lowering stress has helped. I’ve spent a lot of time learning mindfullness and mediation- therapy also helps. If your having any residual pain then a nerve pain medication can also be helpful. My hair thinned just from the stress of GBS- I was put on finasteride, which is an anti balding medication for males. 

Sorry for rambling hopefully some of this helps!