The issue with most kinds of mental health is that the more it affects you the less you're aware of the fact that it's affecting you.
My mental health, without any discernible disorders, reached a very low point last year where I essentially stormed out of a HR meeting because I was "toxic", the toxicity revolved around feelings of frustration due to the fact that I couldn't get anyone to look at a problem I had for six months, which led to me informing the internal providers of that service that I would not be using those services for the next project I was a part of. Which hurt many peoples feelings, I suppose.
As part of the stipend for staying (because, I had quit on the spot) I requested a therapist, I saw him a total of 15 times I believe and he coerced me to exercise a lot more, but ultimately failed to find anything "wrong" with me mentally and stated that my behaviour was quite healthy during that period.. (but he might have been just telling me what I wanted to hear as there's little value in antagonising me during therapy, probably).
Anyway, even with excercise, it's far-far too late, I've basically "turned-off" at work, I don't even try, my entire job has become avoiding doing my job.
I still come home tired, exhausted and utterly emotionally drained, but no work is done, and I don't learn, I don't excite my passion.
No winners.
I recently started interviewing in other companies, I'm hoping this feeling doesn't carry over, and I hope I haven't truly lost my passion.