What Mizzuno said was spot on. I think it's important to remember that this "empty feeling" isn't something you can satisfy with drinking. There's something else at work here. When we are feeling unfulfilled we often turn to the bottle out of desperation - for me it only added to my problems and made those holes deeper.
Please don't connect your feelings of depression to your sobriety. Why do you automatically think that's the reason? That's like saying "I feel sick today, maybe I should quit my job and buy a kangaroo". That makes no more sense than saying you feel like a damper so you might as well start drinking again. Those dots don't connect.
Congrats on your wonderful achievement, you should be proud of yourself. Feel good today.