Gloom

You know the feeling when a really good day ends badly? For example, you enjoyed every moment of it, and then lost your purse or wallet?
You know the feeling when you are inexplicably happy, and then something happens to plunge you into the deepest gloom? For example, you have spent the whole day smiling and laughing, and then a friend calls to tell you they have an incurable illness?
I am sure the Greeks had a word for it, but at this moment, I really don't want to know the Greek for it. The English for it is painful enough.
Damn, I just hope it snows tomorrow.