At work, one of my friends was accidentally exposed to formaldehyde daily for a period of several months. He was getting headaches, nosebleeds, and I think he was even coughing blood. No nerve damage and it's been a few years now. He is worried about his cancer exposure.

I've worked with formaldehyde a little bit in my prior job. It is carcinogenic and mutagenic; you would likely see CNS damage and not peripheral....but you never know.