IPHONE DELETED EVERY MUSIC AND MOVIE FILE?

Today, I plugged my iPhone 5S into my laptop and connected it to Itunes.
I was playing some music, and it worked.

But then, the file stopped working. I tried every other music files from my iPhone, trying to play music on Itunes on my laptop. It didn't work it had an exclamation mark next to it.

I went on my iPhone and opened "Music". All my music files were greyed out! I couldn't play a single song, it said "Item Not available" and "this item can't be played". WTF?

Not only that, but my films/home videos were also removed!1 Why did Apple scam me and deleed every music and video (well, they're not exactly deleted but I can't play them)

Sounds like you moved your iTunes Library, now it can't find the files, hence the!
Then you synced your phone.
iTunes is doing exactly what you told it to do.

Find the library and move it back (check the Trash folder too)
Then when you resync you'll be fine.