Have you tried going to a physiotherapist rather than a chiropractor Chomps? A good one, not someone who'll just massage the problem area and temporarily relieve the pain. Someone who can diagnose the problem (not necessarily the cause) and fix it, not just relieve it.
+1. Or a Naptrapath (a good one). Has helped me immensely.
Oh, and Chomps: Get a proper health checkup... Not to be the bringer of bad news, but shooting pains usually means a hiernated disc. Or worse.