I've googled a lot on the issue and came up with many dead ends.
Basically a few hours ago my phone hit 0% and died, and when I got home and plugged it in it throws me a 'storage space running out' message and is EXTREMELY laggy for the first few minutes after booting.
I've tried deleting /data/log as one post suggested, however that folder does not exist.
Here are screenshots of my storage + the error. https://goo.gl/VPeMn7
My device is a LG G3 (AT&T) Running Android 5.1.1, Paranoid Android 5.1 777 Kernal