I got my finger mashed in an industrial accident, I was wearing gloves at the time, I gingerly removed the glove and that's when I got weak in the knees, there was my finger, hanging by a piece of skin.
It couldn't be sewed back on,. the tissue was too damaged by the smashing.
Sorry to hear that.
Mine grew back just fine.
The worst thing I ever did was nicking two fingers on my left hand in the table saw blade at home about ten years back. I was feeding a piece of wood over the dado blade, it caught and went flying out the garage onto the driveway. I just barely touched the blade. Still needed stiches, but I did not lose any fingers thank GOD.