Venting Please say you can relate

[Qua]

I'm not even sure how to explain what I feel. It doesn't happen often, most of the time I know the reason I'm sad and crying but when this weird thing happens I don't know anything. It just starts like I don't feel anything, I'm empty just like my head. I don't want anything, I feel like I could just sit there and stare at the wall the whole day. But then, when I try to talk about it or realise why it happens, I begin to cry but still no thoughts are running through my head. It's like I'm crying just to cry, I still don't feel anything or feel barely any sadness but have no idea about the reason.
It's so weird and even tho it doesn't happen often, it's draining to not know why I am like that and what to do about it.