My last place of work was very open and understanding about mental health. If someone was having a tough time, they were supported, deadlines were pushed back if needed, there was enough redundancy that one person having interrupted productivity didn't mean a project was going to fail.

I don't know how my current place of work thinks about mental health, and it's a very very small team. I am having a harder time the last few weeks, but I am also a bottleneck (i.e. the only person fluent in certain things) and there is a non-negotiable deadline.

All to say, I'm curious about other experiences dealing with this stuff. Do you say anything? Do you just wait to get through it and hope the lower output goes unnoticed? I'm all ears, happy to learn from other points of view and experiences.