My breakthrough was when I began to write during my commute, at first taking notes on my Palm Pilot, and then moving on to writing full prose on the tiny QWERTY keyboard of my iPaq smartphone. I got so fast that I was averaging 400 words during the 35 minutes or so I spent on the subway each way, or 800 words round trip.
I don't believe in regretting - one should try to move on. My mum was good at that. She was deeply in love with my father, and he died when I was nine. She remarried, and her second husband died, too. I saw the grieving process she went through. My mother had this way of moving on. It was a fine trait.