We still don't know under what conditions coolants contain contaminants. HP is difficult to diagnose unless a doctor specializes in occupational or pulmonary diseases. OSHA says your employer must inform you of the hazardous ingredients and the health effects of materials in writing. The OSHA Hazard Communication standard says your employer must show you a copy of the MSDS within the workshift when you ask for it, and provide you a copy within 15 working days of your written request. Your employer is also required to hold a training session explaining the hazards and controls for materials when they are introduced for the first time, but this could have happened years ago.
Cases seem to be happening more often.
Something may have changed in your work place. Maybe management isn't maintaining the fluid. This can cause dramatic growth of bacteria. Another possibility is an excessive application of biocides. Killing off the usual bacteria allows unusual species of micro-organisms to invade those systems.