Aimee, I don't want to add more fuel to the fire, but the MEPs (or commissioning) physical, and the one you recieve at NAMI are two completely different beasts. One of the guys I went through NROTC with, and was going to be in my API class got NPQd for his eyes while going through the exam, luckily for him, they let him retake the exam after API, if he would have failed a second time, he would have gone NFO.
The best thing I can say about those stressing out about passing the eye exam, just take it easy on your eyes before you have the physical. Eliminate your sources of eye stress, watching TV or the computer, reading, and get a good nights sleep! Also, hydrate, hydrate, hydrate, you should be getting up in the middle of the night since you would explode with all the water you should be drinking.
I know EXACTLY what you are going through, the eye exam was my biggest concern, so much so, that I went to a civilian eye doctor and paid like $60 or so on an indepth eye exam. I told them what I was applying for, and they were great, spent alot of time with me, and explained all the possible tests to me. Best soul soothing $$ I have ever spent.
Oh well, my 2 cents...