There's a wide body of research on aviation mental health. Basically, they'll give surveys to pilots in the general population with questions like “Do I sometimes experience stress?” or “Do I sometimes have anxiety?” Those findings suggest that within the pilot population, there's a tendency to deny any mental health issues.
I think that it stems back to the very earliest days of flight training, when pilots knew that if they lost their medical certificates, they would lose their careers. That made it much more difficult for them to seek help or even acknowledge that weakness.
I think there's a lot to be done to support mental health issues among the aviation population, and pilots specifically, to avoid those kinds of issues in total.