Back injuries have a tendency of coming back to haunt you forever, so make sure you fill in all of the incident & workcover paper work to make sure you get looked after.
I had a back injury in high school - it still haunts me occasionally, and has been prone to causing me to wind up spending a fortune at chiropractors every time both disks start getting out of whack again. It gets damn expensive missing time off work and seeing specialists to fix these problems, and that's before you get to the actual physical pain.
Don't get lazy over the paperwork. I'm yet to meet a person who's had a back injury from work that is ever "fixed". It might stop hurting for a few years, and one day you'll bend the wrong way, and you'll flare it up again.