Congrats, man!

Your LD is prob a DILD. Mantras are an auto suggestion that you hope will pop up in your dream and cause you to become lucid. (Unless you did a WBTO then you may have WILD'd)

Maybe it was just the dream you had that you felt you weren't awake

If you feel you're loosing the dream, stop and say, "calm down" and I'm sure there's other things you could say (I said that when I WILD'd yesterday afternoon and it worked)

You just need to stay calm and not get excited. Once you can control that, you'll be on your way to longer LDs