What a terrible week

I did only the half of my homework. I doubled my position at 1365 but all was a bear trap. The next day I was out for half of my position after the big gap (the AAPL gap!) and on Friday I sell my first position on SDS after being in the market without a stop. It's the problem about second guessing. It usually makes you lose money. It's my second operational error this year and the two have cost me 1,5% of my capital.