I think I said something like this pretty recently. I had a great day yesterday and now today I feel alternately empty, then sad, then blah, and back around again with some loneliness thrown in. It's like feeling so loved yesterday was too much for my world, so I get the opposite today. It's so dumb! I'm not punishing myself. I just feel so bad that it seems like I'm being punished by someone else for having experienced good emotions yesterday.