he doesn't listen!

I've told my bf so many times before that when I'm upset I need to be left alone to figure out why I'm feeling the way I am. For the last two days I hadn't been feeling good mentally so yesterday I told him I needed to just breathe for a little and that I'd talk to him later. I understand that he's worried and I appreciate that, but I need him to listen to me and trust me when it comes to knowing what's best for myself. When I got home yesterday I just wanted to go to sleep (it was like 4) because of how bad I was feeling, but instead made myself go to the library to do my work. I know how to take care of myself, I'm not a baby and I don't need to be babied. We're going to talk at some point today but I'm just so frustrated and don't know how to make him listen and understand.