The 3rd is because of offense, but 7th in walks and 33rd in ERA is his fault, not the offenses...
You for some reason don't think that having a ton of pressure on you to throw the perfect pitch inning after inning would finally get to someone?
If you are constantly in tight games or are trailing, and you want to keep your team in the game, it is hard to win. The pressure will eventually get to you and it will ruin your confidence. Remember how it seemed like Foulke would always get rocked last year? That's the kind of s*** that happens when you lose your confidence.
Him having a higher ERA, a higher BB total, and a higher loss total can all be contributed to having a lack in offensive support behind you, though only the loss total can be directly linked to the lack of offense. Pitchers are human, just like you and me.
I don't know about the lack of offense, but definately the 12 unearned runs and the extra pitches associated with them.