I can't say that a feeling of emptiness is an onset of early depression for you. But it is a symptom of depression. Especially if you are feeling that way a lot. And I have had it.
It is just like something is always lacking in the way that I feel. When I am depressed, nothing can make me happy. I am always sad and lonely. I have no interest in things that I use to love.
It would be something that you could talk to your doctor about. They could give you a more deffinate answer. But for me, if I were feeling that way, I would suspect that deperession might be sneaking up.
I am sorry that I can't give you a better answer. I can only state what is my opinion from my own experiences.
I hope that this helps.
fibromyalgia, Chronic fatigue, depression,allergies