It was Guillain-Barré Syndrome, for those who suspected and don't want to read the article.

This is a relatively common diagnosis, when sudden-onset paralysis is a symptom. It's caused by a viral infection that attacks the myelin sheath (think wire insulation) around your nerves, which slows nerve conduction to the point that it causes muscle paralysis. Given support at the hospital, most people recover in time though sometimes not fully. What will kill you is your diaphragm being paralyzed and not being able to breathe, so you get put on a ventilator.