It’s nice to hear that you’ve achieved what you were waiting for. Don’t worry about not being able to control your emotions during your first lucid dream, that happens to everyone 
To make your dream longer and to control your emotions I suggest reading this guide - Dream Control Training Course. It’s quite long to read, but it’s certainly an ideal guide for those who want some knowledge about relaxation/stabilisation techniques. Wish you good luck on getting yout next (and, hopefully, longer) lucid dream.