Back Attack= Training Advice Please

One week to go until the New York City Half Marathon, and I hurt my back. I want to come up with a "macho" type explanation like I was having wild sex with my wife and threw out my back, but I cannot tell a lie. Yesterday morning I bent down to pick up my shirt, and my back went into wicked, hurts so bad I was dropping f-bombs, spasms of pain. I couldn't even walk, never mind run yesterday. Every time I sat down and got up, my back felt like it was locked in place. It feels better today, but I don't know if I'll be able to run. With a week to go, my longest training run for the half has been 7 measly miles. I didn't run because I couldn't run for the month of February. My longest run of 13 miles or longer was last November 1st, the NY City Marathon. Not running the half is not an option. I'm asking for your advice. I'll probably only be able to run 3 times in the next week. Should I try for a 10+ miler for any or all of those runs? Should I just "take it easy" and get in some miles, and hope I can run NY on adrenaline and determination? I don't care about my finishing time for NY. I just want to run it, experience it, and most importantly have fun and finish it. Any advice will be greatly appreciated. UPDATE: 10 a.m.: Back pain is pretty much gone! I've already been to a P.T., as you know, and going to a chiropractor is not an option. I'm actually looking for training advice, not medical advice. Thanks!! :-)