I'm so sorry you're having a bad day. This here is a place where you can tell the truth about how you feel.
When people sometimes ask, "How are you doing?", I sometimes respond by saying, "Don't get me started!" Have you noticed that asking how someone is has become basically a ritual? The person is to say, "Fine, thank you" and move on. I've even had people say, "Fine, thank you" when I didn't even ask how they were! Like robots!
I do hope things will get better soon.