Two things come to mind?

I have and have read anecdotally of many who have tinnitus [ringing in the ears] well prior and worse after GBS/CIDP.
As for taste changes? Web up the medications being taken for both the pain and anything else.. look up ‘prescribing information’ and read the ‘reported side effects’ and further down, the ‘less common side effects’. Many, many meds affect how we taste things.
As for cravings? I’d lost all desire for any foods once I’d come down with this all…. I forced myself to eat tame or mildly tasty things just to get nutrition into me! Especially when your taste overall is warped [as are your nerves] it’s sort of a force-feeding process. I found Ice Cream helped! Didn’t care what flavor tho.