Google it for sighs & sympoms of poisoning by formaldehyde
Had a quick look, but couldnt see any of the symptoms your friend described.
Noentheless he should get himself checked.
Just as a matter of interest, when you die and your donated body finally finishes up being investigated and dissected by medical / science students, it may be preserved in formaldehyde.
Although I think they have new beaut stuff now which is more user friendly ( to the students that is, not your good departed self )
