I am constantly exposed to lead, how damaging is it?

Very: I presume that this is an occupational hazard. It has its most important effects in the brain and nervous system. You need to get a blood lead measured and if it is increased, some form of chelation is needed. See your doctor.

Depends: Some forms are more likely to be problems than others. Aerosolized lead is very toxic and one reason OSHA requires protective gear for those working with it. (Battery reclamation centers) Just being around lead is not a real risk.Your doc can do a simple blood test to monitor exposure. At high levels it can cause anemia/brain damage/seizures/death.