[bjourne]

IMHO your complaints are minor. 2.5/5 on the awful work place scale, where 1 is the dream job and 5 is a job on which you are physically assaulted. For example, "Strong opinions that are often wrong" is a description that fits nearly every programmer and manager in the it industry.

That said, what you can do to make your life easier is to admit when you are confused and ask your coworker to clarify what he or she means. You can also ensure that your boss knows that you are working very hard on ensuring that there is no communication failures so that you aren't blamed in the future.

That your coworker has said that he or she has ADHD implies that they would like you to be considerate of their mental illness (disorder, disability, exact terminology unimportant).