I Just Can't Get the Reason Why I Cry, Sometimes

pencil on sketch book
coloured on photoshop

Have you ever cried for no reason?
I have just cried and I don't know why. Sometimes I feel like, Oh God I have so many many problems and I don't know how to solve it, I might know how to but it is so hard I think.
suddenly I cry after took a little nap this afternoon. And then I draw this thing, hehe. I call it 'a crying picture'