I felt like you did a few years ago. I'm not sure if it was a form of depression, but when I look back now, which I can do and have a bit of perspective about it, I would say I was depressed, but obviously not clinically.
My sister described me as I seemed to have a swinging brick for a heart.
I was extremely unsatisfied with my life. Problems with marriage, job was shit. Just had this overwhelming feeling of 'there's got to be more to life than this'.
I was unintentionally rude to very close family and friends.
All I knew was that I loved my dd and everything else paled into insignificance.
Focussed on 'being a mum', getting through each day, and that was it.
It came to a head one day when I told my dh our marriage was dead.
He begged me to go for counselling and I did and it turned my life around.
Now I am happy. Still with dh, whom I love so much and it was a very strange phase, which when I look back now, built up over a number of years. It wasn't just like I woke up one day and felt like that.
Hope I am making sense OP