Welcome to Dream Views and congrats on the lucid dream.

When I joined and started seriously trying to lucid dream, it took me more than two days to have one. Great job getting there so soon.

About not freaking out, try not move and just take in different aspects of the dream, sights, sound, smells, etc. Instead of getting over excited try to appreciate the dream world that is wrapped around you. Sometimes it only takes a few moments of appreciation to solidify a dream.