Something I've never felt before

My skin, tingling, goose pimples bumping-- aching to touch. My head, airy, unable to focus, yet the mere sight of you makes it happy. I'm feeling.. edgy, anxious, excited, fearful, all rolled into one, as though the cherub doesn't wield bows and arrows but Thor's hammers-- electrifying, sense numbing, leave thy heart trembling.
And then the day ends, and the stomach pangs. My head, airy, unable to focus.
And then sadness. What's this feeling I've never felt before?