Pretty often lately it’ll happen to me that I’ll look bewildered at reality and just feel like something, even though I can’t quite tell what, is wrong. Wrong as in, things just aren’t going the way they’re supposed to. You think it’s going…fine enough, but then you’ll feel like you’re fricked. Either you messed something up or it was out of your control but either way something went horribly wrong and you can do absolutely nothing about it. So you’re there sitting waiting for the worst to occur just so you can simply accuse it to be the reason for your feeling and call it a day and forget about it. It’s that, or it’s feeling like something with reality itself feels off, almost dreamlike. Though it’s different from derealization. I’m really challenged as I lack the vocabulary to express it all well.
Not sure if this is along the lines of what you’re referring to, but sometimes I’ll feel like the world is slightly out of phase. Or maybe I’m slight of phase with the world. It’s hard to describe, but like you said you can’t quite tell what is wrong; just that something is off. It’s quite disconcerting honestly. Wishing you the best!