I like exercise to ward off tilt issues. Go for a nice run or some other cardio activity before playing.
As for your play. I had a 20 BI down swing back in the end of October, so I can relate. I would say 60% of that was short term luck and the other 40% was tilty play brought on by bad luck and just general frustration.
Will641, I would strongly suggest looking up a number of marginal HHs and posting them or session reviewing them with another 100NL player. By marginal, I don't mean your biggest losers that everyone is going broke with. I mean your medium sized losers & winners where you could have made a bad river call or missed value.
I have played with you in the past and I doubt that you need to completely re-assess your approach to poker. You seem to have a good general game. Are you getting bluffy? Tilty? Experimenting with new theory? Straying from your starting hand range? You seem to play a ton of hands per month so I can't imagine your core game has changed much in 2 sessions.
I am willing to review hands if you like. PM me for email addy if interested.