Car randomly died & code P0021 - HELP :(

gor

Hi all, so I purchased my 2009 370z 6MT a few months ago, have driven it about 1500 miles since (currently at 95k miles). Took the car to the Nissan dealer where it was serviced, and had the service manager talk to me about the car and how it was literally mechanically perfect. So everything seemed great. Fast forward to now and the car randomly died on me while I was driving.

I did an oil change a couple days before and only 1.5 quarts came out. Yes, I know.. I should have checked sooner. I was infatuated with the car and mistakenly took the word of the Nissan service manager.
Few days later I noticed some power loss. Very slight, it was about maybe 10% slower, but noticeable. Thought it might be bad fuel, so I decided to just wait until I empty the tank and refuel. The next day I start hearing some loud rattle sound from the engine bay. That same day, my AC stopped working and only blew hot air for a couple of minutes, so I figured it was maybe some AC fan or a condenser, kept driving. Was going to check it out that weekend.

While was driving I noticed the rattle changed with the RPM's (uh-oh). I was a decent distance from home but on my way back when the car suddenly died on me as I stopped at an intersection. Wouldn't start, would barely even crank once. Had to get it towed back home.

Took out the code reader and I got the code for P0021 for "Camshaft position - timing over-advanced or system performance bank 2". After some research, some people with this code had their gallery gasket blow (or galley - idk lol).
To be honest, I'm really not sure what it is. I was wondering if anyone had experienced a similar issue and could give me some pointers. At this point I'm pretty much expecting that swapping the engine will be cheaper than any repair lol.

Here's a sound clip of the rattle: https://www.youtube.com/watch?v=-1p6...ature=youtu.be
Here's a sound clip of me trying to start the car: https://youtu.be/iQcN7dbMup0

Really worried and stressed out at the moment..
Thanks a bunch in advance.