Big loss, new lesson

After a long spate of strong (exceedingly strong?) uptrend in the market, today the momo dropped out. I'm currently at a reasonably/big loss. 

I traded too big.

On a down day, don't trust break out/up. (Obviously?!)

Currently holding one last position that feels too big, esp too big for the spread. Walking away with a bracket on it.... it stopped.

LESSON. In the case of a losing day, the remedy is go smaller not go bigger. Do I need to learn this over and over? When I'm "off", go small.

Today, probabaly esp bc Monday, I had ok-sized losses, just too many and on position size too big. So %-wise, controlled but it just added up too too much red. Need to keep positions smaller on days when things aren't working.