It sounds like you're looking for a cure for your pain, as we all do. But a lot of times cures aren't possible, so we have to manage the pain, and as you indicate you had some pain from the accident and that's probably not going to totally go away.
I would say you probably have to accept some level of pain, and try to put together various treatments that help you minimize the amount of medication you may need. That usually starts with a good physical therapist, and then learning to include the right stretches, etc. (and I'd suggest learning from a PT rather than a chiro) into your daily lifestyle, along with learning how to stand, sit, move, etc. with good posture and ergonomics. Even with that, you may need medication. No medication is without side effects, as you indicate, be it OTC products or narcotics or anything in between. Most all of us would like to not take the medications we do, but realize it's the only way we can have any quality of life. Seeing a counselor or psychologist who specializes in dealing with pain issues may help you make peace with whatever pain won't go away.
I would add that the fact you've got addiction of any type in your family means you may have a genetic predisposition to developing tolerance more quickly. Many of these drugs use the same pathways - be it alcohol or xanax or oxycodone - in the brain, and can create the same type of effects re: addiciton. So don't think because it's alcohol in your family tree that your genetics have no relationship to the other substances. I'd suggest discussing this with your doctor to see what options you have; you may want to consult an Addictionologist, who is an M.D. with a specialty in addiction medicine. As with all of us, you want to do all the non-pharmaceutical things you can to help yourself first (PT, acupuncture, etc. - if you can afford them, and if they're appropriate).