JTO, true, we lost an ex-flt cdr about 30 years ago. There were signs, with hindsight, but what can untrained JOs do?
It is not just mental health but any health issues particularly amongst air crew, hence flying pay insurance.
I had hearing issues 20 years before I retired and although downgraded remained on front line noisy jobs. Only on retirement did I get compensation and hearing aids.
I think aircrew in general, who want to remain in, avoid medics like the plague.