Hello,
I am a 58 yr. old male that is 18 months post GBS diagnosis and my short 8 day stay in the ICU.  Mine was rapid onset, caught and treated early and I consider myself lucky.  Doubt I will ever be close to 100% but I’ll take 75 – 80% as it could have been much worse so I am thankful.  No provider can definitively say what brought it on nor are they even willing to discuss or speculate.  Was it the flu shot (doubtful that was 8 weeks prior), an infection or illness (wasn’t sick) but I did have a minor surgery 2 weeks prior.  The research I have done I suspect it was the Ciprofloxacin they gave me during surgery.  So here I am, I work for a hospital (remote for the most part) and last week they mandated all employees get vaccinated.  For me, I am going for a medical exemption as there is no way I am potentially putting myself back in the position to get a recurrence of GBS.  I weighed the statistics of GBS vs. Covid (for me personally) and the choice was clear.  If nobody can definitively tell me what caused my GBS they sure as hell can’t definitively tell me I’ll be fine with the vaccine.

As is the case with most of us the doctors don’t know and won’t commit as it’s all a big mystery. I contracted within 2 weeks of a minor surgery and 7 weeks post flu shot, every provider has thrown up their hands as we my never know.
With regards to the 2 people on the call whom contracted after the vaccine, they were both adamant that the vaccine was the root cause although as is expected they both received push back on that assumption from the professionals. I believe one if not all reported to VAERS as well and one I believe was interviewed by someone at or associated with the CDC (who again tried to discourage the notion that it was the vaccine).
From the adverse reaction to the vaccine whether GBS had something to do with it, no way to tell.