You know - I have to have a jaundiced respect for a lot of jobs I see that people do.
The phrase "I couldn't do it" springs to mind. Not because I don't have the perspicacity or learning ability, purely because I couldn't cope with the onslaught of clients, making decisions about what must be done and still going home and forgetting it all.

What I have done all my life is not easy, cerebrally, but it never gave me nightmares.

I did consider a counseling course once, but came to the conclusion I was a problem solver by nature, rather than a listener per se. See a problem, think of a workaround. Not what a lot of counseling is! Seeing people having already talked themselves into a corner and turned their back on the exit is mentally tiring.