It's almost without exception: whenever I entered a trade emotionally without planning, I'd get punished. Today I kept pondering the prospects of a double top on SPY on the daily chart. I was away from the streamer for a while and when I came back I saw SPY made new low for the day. I quickly entered a short position. And it was practically the low of the day. I ended up spending the rest of the day fire-fighting to salvage my position. And that brought up another point: I still have too much ego to admit defeat and take loss. Fortunately I had other profitable trades today to end the day ($20) in the red.
I've got to stay disciplined, and plan the trades and take losses.