Confusion....

How do you describe a feeling that even you don't know what it is? How do you resolve it if you can even figure out what and or where it has its roots?

There are days when I have this feeling in my chest, I try to make sense of it as anxiety, discontentment, worry, maybe even an insecurity. Then yet again, I have no reason for any of these. 

When the feeling dissipates, I find myself asking, what it was all about, better yet, I sometimes don't even remember it....