Is Central Auditory Processing Disorder covered by Americans with Disabilities Act As an RN I have heard orders incorrectly because of CAPD and am unable to work.?

Yes, CAPD is listed among the disabilities covered by the ADA. You should be recieving either aid from the government, or special assistance at work. If you have informed them of your disability, and they fired you, you might also coniser a lawsuit, as that is illegal.