I'd be glad to help if you would kindly PM me a few of SoutherGirl's pics from your private collection.
Just kidding, hopefully you have been using ice and anti-infl. for the past couple days.
Well, if the intial injury mechanism was hyperextension, you could have irritated a facet joint, which then when you bent forward caused stretching of the capsule and reflex muscle guarding. Obviously, it is impossible to know without examining you.
To help you a little more it would be helpful to know a little about your symptoms at this time.
What movements/positions increase or decrease your symptoms?
How is sitting versus standing, walking, laying down, bending, squatting, etc.?
Also knowing how it responds to repetitive movements would be useful. Does it hurt to bend forward and if you bend forward 5-10 times does the pain stay the same, get worse or get better with the reps? Does the ROM increase with rep. You also want to bend backward in the same fashion.
Then lay down on your stomach and do some repetitive press-ups, similar to the cobra yoga position. Answer the same questions.
Once we know how your back symptoms are responding to loading, some more specific recommendations can be given.
Keep using ice 15-20 minutes every couple hours throughout the day. Anti-infl should help for a few more days. Try to keep moving and stay active without doing any activities that place your back under significant load. Don't sit for more than 20-30 minutes without standing up and moving around for a few minutes. Try to maintain the lumbar lordosis during all you daily activities. A rolled up towel placed in the lumbar curve when you sit will help decrease LB strain.
Hope that helps and once you give me more info, I'll see what else I could recommend.