Where do tears come from?

I am not looking for the "scientific answer", I know that one. The question goes deeper than that. When you seem to have cried all you have, and your eyes hurt and are red and swollen, and then come more tears, where are they coming from?
I despise having the heart of a woman, my heart is a bottomless pit, (which can go both ways, as it can be full of love, yet not full enough, or full of lonliness, hurt, despair...)
I will not deny that today my heart is black, the grief and sorrow are overwhelming to me, for if I did, I would be lying.