I have had 2 -$1000 swings this year. That's about 10 buy-ins or more each swing.

I don't keep any specific records aside from the size of my BR.

Some days you win big, win little, lose little or lose big; depends on how the cards are running and if you run into a lively table.

Don't concentrate on short term results. Every session cannot be a winning session. Just make sure that you evaluate your play on the hands you lose. If the money goes in when you are a big favorite and you take a beat shake it off and take it for what it is. But when you evaluate your play, be honest with yourself. Did you infact misplay the hand and invite the suckout, or did you force your opponent into making a bad play?