I have told you that I felt very bad yesterday, and I didn't know why. Now what I want to tell you is that I fell much better today, I didn't know why either, I just know I feel better.
Oh, God! What a thing! The only reason I can think is that it is a emotion cycle, which is out of my control.
I hope I can control such emotion cycle in the future, because it makes me feel bad, I don't like that.