It's a well known problem in the industry that pilots don't disclose a lot of stuff for fear of having their life's work taken away.
And to be honest, I don't blame them. You have a system where one assessment of a mild condition could break your whole career. On the other hand, aviation is a very safe industry.
Somehow it's fine for clearly mentally ill people to drive cars, own guns, serve as police, lead armies and nations. But your average pilot - who has an insane investment into their career - has to worry that if they mention that they are unhappy that their dog died, that can end their career.