Since it isn't the first time, and it's not going to be your last, you really don't have much choice to ride it out. I am not sure what you do, but I tell my guys that when the job gets boring, they have to create work for themselves. That never sounds good at the time but those that take my advice come out of their slump faster. And as sales people, that usually equates to more money.. I am sure we all go thru it. I own the company and there are times I go thru it. It's tough to stay motivated all day, every day.
If you don't like that advice, just post some bullshit on here and maybe pick a fight or two!! ha ha