THIS IS VERY IMPORTANT!! So I need to access my USB for my school but today I plugged it in and it has a new drive letter it was G:\ Now it is H:\ so I took it out and put it back in and it still stayed H:\ So I went into the drive And Saw all my files missing! But there are some other files With the names:

(This file name had two boxes like) [][]
t
0

My USB is at the same storage that it had left before and I tried Repairing it and nothing happened. PLEASE HELP

BUT
I NEED THOSE FILES!!!!
SO NO FORMATTING!!!!!!!!!!!!GetDataBack works but costs money. Not SURE of any good free ones that work. http://www.runtime.org/data-recovery-software.htm

They have a try before you buy download. If you try it and it shows the files it is able to recover, you then have to buy it to recover them. Once you own a license of it, no more COST for future recovery.

I performed the try before you buy on a laptop that had a crashed HDD with the clunk of death and this software got back a good 90% of the data back. There was about 10% of the data where the hard drive was too damaged to recover.

Given that your device is a flash device its probably just corrupt and so you should get 99+% back as long as it has not been overwritten.On that note Recuva is a free option.
That being stated USB drives don't simply "HIDE files " or create new partitions...so you must have done something....
Hopefully your data is still there...i give it LESS than 50/50 though.