I'm sorry your son got Guillian-Barre syndrome. Of course that means he is not a candidate to get vaccinated, but that is precisely why it is so important that people who are physically capable got the vaccine. Because we don't want him to die of Covid-19 either, and for him it is other people's vaccinations that provide protection.

The 6 feet rule is an approximation based on research into how far virus-laden droplets will move when people are engaged in normal speech and similar activities. If people are doing something like singing, or exercising where they are breathing heavily, six feet may be too close.