I had a sister-in-law who had GBS years ago. She was a hospital floor nurse at the time, so assumed it was contracted from work. She did eventually have a complete recovery; until suicide took her in 2014.
I am sorry to hear of the suicide. Ther is very sad. Offering a word of prayer for you even years after
GBS is an autoimmune disease. Your immune system attacks the nerve sheath.
Something like a vaccination or an infection can trigger it, but you don’t catch it like you would an infectious disease.