Maggot endorses the above and encourages you to follow that advice.1) You need to document your complaint with your Union rep. If you're choosing to pay the Union, they need to do their damn job (with OSHA, too). I'm not sure if this paperwork ultimately is a Workmans Comp claim or not, but... file the complaint.
2) Before you do this, see a pulmonary specialist. You should have done this a long time ago with this concern. Do it now.
3) Document examples of exposure: glass fibers that are visible implies harmful glass fibers in the air you are breathing.
4) Two-weeks notice is a customary courtesy. It is your choice. Be prepared to be shown the door that day, though. It is what it is.
If you do NOT visit a doctor and if you have NOT been wearing at least an N95 mask at work, you are not protecting your health.
Personally, I would pay a lawyer for a consultation to (A) have your concern further documented and (B) identify if there are legal avenues.
This is the United States, we shouldn't be having to have this conversation.
Document
Document
Document
Leave a huge paper trail/