My father had Guillaume Barre disease back in the 60s, so I know only too well what a horrible thing it is.
At that time, there were no flu shots, and it was thought to be a complication of the flu. I haven't really followed the studies implicating the flu shot, so I can't comment about whether your chances of contracting the disease are greater or less with or without. But I admit, I have decided to do without.