well, what a good question. For my part it's been a long time since I haven't had a feeling of sadness or happiness. It is as if I don't belong in my body. Something really sad could be happening but I show no emotion and I can't describe what I'm feeling. I've been like that since forever.
happiness is not an emotion that lasts for me, though sadness can be likened to the silver lining in my life as i do not take it as a negative quality.