Should I shoot myself or maybe just cut off a finger?

So after two and a half months of every day studying (twoish hours after work everyday, four to six hours every Saturday and Sunday), I thought I was moving along pretty well. My goal when I started studying was a 650+, and that's the range that I thought I was in, based on GMATPrep, PowerPrep, and PR CAT scores ranging from 640-670 consistently. I had been saving the Kaplan tests until the end anyway, but decided to take one today because I was feeling alert, awake, and curious.

So, one score of 540 later, I think I'm ready for suicide. Have I really sacrificed my sanity and my summer for nothing? I read these boards pretty consistently, and I know that that Kaplan is hard and should be taken with more than one grain of salt, but a 540? I figured 580-600. Some of those questions I couldn't have gotten if I wasn't on the clock.

I know that most of you guys are in the process of studying yourselves, but can I get a little advice/encouragement from anyone that's already taken the exam? Maybe something like this happened to you? As is, I view those other three Kaplan practice tests like I view the pair of shoes I just bought that gave me bad blisters the first time I wore them. Unlike the shoes, however, I feel I have to give the test a second chance...

My only hope is that these Kaplan tests are designed to be ultra-hard so that the actual test seems easier, kind of like how you warm up for baseball with a weighted donut on your bat...when you take the donut off, the bat feels much lighter than it did when you first picked it up. Is this a decent analogy?

{edit} While I'm at this, any advice on how to stop the scroll bar from blinking in the Kaplan tests? Very annoying to have to click somewhere on the body to stop it, or keep the left click depressed on it.