Overcoming Self Doubt

I'm not a person that usually doubts myself. I'm very opinionated and sure of my beliefs. But for the last few days I'm having a crisis of faith.
I'm convinced I'm going to fail my VTNE exam.

I've been studying and reading and thinking about stuff at work for months. I've gone into Defcon 5 mode now, since the test is less than 14 days away. I've even started to review the math questions that I forgot how to do, and feel a lot more confident in my calculating ability.
Yesterday I took a practice test, straight from the Technician Review book that is one of the texts I'm studying. As I answered the questions I felt confident. I felt that things were finally coming together. I could even do the math.
My grade was 70%. When I first started taking the practice exams my grades were in the 60's. How can I feel so confident and yet not get more than 70% correct?
So last night I gave up. I went to my bookshelf and grabbed a fiction hardcover that has been waiting for me to read it, and I immersed myself in it. I sulked and posted a pity status update on FaceBook. I told myself it didn't matter if I passed.
What is wrong with me?
I woke up today with the attitude that I only have a few days left, maybe I should just go ahead and keep reading/studying. Who knows what the test will be like? I have to make the best of things, since I devoted so much of my time and energy to it. I know it's not the end of the world if I don't pass, and my friends keep telling me I can take it over (but I'm not sure if I can, due to new regulations) , but I know in my heart I have to give it my best shot.
I will read over the chapters on diagnostic imaging tonight, and do math problems every day until Dec 8th.
I may or may not take another practice exam. I WILL try to put all negative thoughts out of my head and rely upon my intelligence and natural self confidence.

I just wish it were all over already.

A Fly in the Ointment....Not Exactly

I've recently begun to adopt the habit of taking crushed ice in a cup with me to work. I used to nibble on the ice in the car on the commute in, but now I've decided that I might as well eat the rest of it at my job.

I ate my ice this morning like I usually did. I would scoop up a spoonful of ice, slurp it up, and continue on with my typing or filling out paperwork or whatever. About halfway through the cupful, as I brought the spoon to my mouth I looked down at it, for some reason.

There was a bug on my spoon. I called another tech over and we both peered at it. "It's a FLEA!" she announced.
"I think it's just some kind of BUG!" I said.
"No, that's a flea for sure," she told me. "Want to go check it out under the microscope?"
Of course I did.

The little spot on my spoon (that was on its way to my mouth to be EATEN) was indeed a flea. He was cold, as he was nestled among my crushed ice. We marveled at his tiny eyes, his little flea legs, and the fine hairs along his body.

I wanted to gag. I almost ate a flea.

As we continued to alternately peek and shriek at this little creature, he suddenly moved. We both jumped back, for the magnification of the image caused the movement to scare us. Turns out he was all thawed out from the microscope light beaming up at him, and he did what all fleas do: Jump.

He was gone.

"I knew I should've put him in oil," I said. (Oil is used to prevent mites from walking off the slide before you can find them in all the debris.)

I still don't know where the flea came from, exactly, since my cup was not around any pets. But one thing is for sure: I will always look at my spoonful of ice before I eat it.