I got into an accident and they are trying to settle my bodily injuries, What is a good price to settle for?

I went into the ambulance and had seen a doctor. She prescribed me some florexil. I had a little pain in my lower and upper back. AM I BETTER OFF GETTING A LAWYER FOR THAT? I FIGGURE IF I GET A LAWYER THATS 33 PERCENT OF MY MONEY AND ANOTHER BIG PORTION GOING TO MY CHIROPRACTOR. Should i just settle it out with the insurance on my own? How much?