I've been thinking, and I think I may have answered my own question in a way. I mean, I'm that focused on all the things going on around me, and sort of ignore my own situation, that I fail to address it.
I have a habit of "soldiering on" while it's bareable. I'll tell myself "I can manage", up until the point I can't. My current situation is in part responsible I think. I am or was in a relationship with someone who isolates like I used to, and sometimes still do if I'm honest. Long story short, the relationship has been causing me a lot of anxiety and depression. She has her troubles too, and I try to help and support her. So despite the negative impact it's having on my own mood and such, I soldier on, try to be her "rock", for lack of a better phrase. I don't want to let her down or fail her, and I don't want her to see me as weak. I want her to see she can depend on me regardless. That I can deal with it, ya know? Add on top of that how we're having problems, and I'm focusing so much on her/us that I'm not thinking about how I'm doing... It's no surprise that it eventually get's too much. I think I focus on other people too much, to my own detriment. Maybe I do that to escape my own problems, avoid them instead of confronting them... I don't know.
I am on a waiting list for therapy at the moment, and I am now focusing on myself again. Before we met, I was making progress. And at first, she enhanced my life, made things feel easier. But when things started going wrong, I neglected the things I was doing before we met. My routine, my sleep, my eating... All the things I did to help myself get better, I lost sight of them focusing on her/us. So I'm addressing those and establishing them again.
All this being said, I still welcome any input anyone might have.