I've been feeling like that too lately, actually for the past months really. Like, if someone just pointed a crocked finger at me I'd almost burst in tears. And I never used to cry this much. I guess it's all just the stress and pressure I have been putting myself through.
I used to tell people off pretty much imediatly if they were yelling at me or making me feel bad, and now I just hold it inside. I guess that's what depression is like, you just lose yourself in negative emotions and forget the things that make you happy and matter.
Just don't forget to eat for 5 days in a row and almost pass out like I did.