Chiropractic treatment is not a 1 time thing. You'll have to go for a few sessions.
But again, these are passive treatments, effects are usually temporary.

Instead I would recommend trying physiotherapy. A good physiotherapist would give you a bunch of homework(exercise) to do. If they start hooking you up to electrical stimulation machines... Then stay away as the effects are short-lived.

Perhaps your migraine could be due to tight neck & shoulder muscles. So a physiotherapist would recommend some exercises & lifestyle modifications to deal with it.

Also, studies have shown that ANY kind of exercises would be effective for back pain. The key is to "be active". Do you adopt a rather sedentary lifestyle? When was the last time you did some form of exercise?

PM me if you'd like a recommendation for a physiotherapist centre