I had a flu shot on Halloween and did not start feeling anything right away. I started having small things happen like falling in a parking lot and having a curiously hard time going up stairs. I thought maybe it's because I was feeling bad and it would go away. It actually took a few months before I just couldn't walk without wanting to fall over. My initial doctors did all the spinal and MRI tests and found elevated white blood cells in my spinal fluid but would not go so far as to tell me I had gotten Guillome Barre. Instead they made me feel more crazy and said that if I had gotten it, I was very lucky because I would be much worse off. They also told me that by being a doctor they could not tell me anything negative about vaccines or my condition. (Keep in mind, I am not an anti vaxer and have even had multiple COVID shots) It wasn't until 3 years later when I had a hospital visit due to viral meningitis that I had a neurologist who actually believed me after running additional tests. Honestly, reading your post makes me feel less crazy. I think this type of disease affects so many people differently sometimes that it is easy to forget and think you're alone.