I think it's wise to let small dings on an old car go. Save your money for engine trouble. Reliability and longevity is more important if you are on a tight budget, especially if the car is paid off.

And taking care of your body is more important, as well! Smart move. Make sure your pain isn't limiting your full mobility before you see a chiropractor. If you are experiencing more than mild pain and stiffness a chiropractor might make it worse. Massage and muscle relief first before you tackle your nerves and bone alignment in my opinion.