Before you, Bella, my life was like a moonless night. Very dark, but there were stars—points of light and reason… And then you shot across my sky like a meteor. Suddenly everything was on fire; there was brilliancy, there was beauty. When you were gone, when the meteor had fallen over the horizon, everything went black. Nothing had changed, but my eyes were blinded by the light. I couldn’t see the stars anymore. And there was no more reason for anything.
--Edward Cullen (New Moon)
So, you have it all. Not more, not less. Just perfect. You don't want this career path to get messed up (I really wanted to say "screwed" but yeah...), you don't want the vacation of life to end, you don't want this security to go away, you don't want that Smile to stop...
And one'd think that all this bliss is surrounded by a non-stop feeling of...well, bliss. Only it's not. There is this part of you that is constantly on its guard, lest it all go away. And that's a scary feeling: thinking that it might all go away. The feeling of despair. The lurking feeling that this must not stop. Or I'd die. Or so I feel.
So, I pray to God that this moment stays. For eternity. Or get better. :D