For what it's worth. I worked with a chiropractor for several years. He trained me in gentle warming massages, which were done one patients before he began treatments. Many patients thought he was a god! A few didn't come back after initial treatments. He often used other chiropractors to cover when he was on holiday. None were ever considered as good to regular patients.
I had on one occasion coughed whilst cleaning my teeth which caused a facet joint problem, it was agony !GP could only prescribe Diazepam for a few days and rest. My boss treated me and after a couple of weeks there was much improvement. My boss got cancer a few years ago and since he died I have had a few problems mostly back and sciatica. I tried a couple of other chiropractors with relief for a couple of months but always needing to go back. I then tried an osteopath when I had trouble getting an appointment at one time. I had similar results. The main difference I found was osteopaths are more gentle and lead you through exercises more carefully and are less 'showy' than chiropractors, the don't intentionally go for 'cracks'. In the last 18 months I had retired and my GP service offered self referral to physiotherapist at local health centre. It was free, so I tried it when my back started twingeing again. After an initial consult, I went to a 'Back club's once a week for 6 weeks. We did exercises in a group of 6 and were advised what to do at home individually. I had about 6 follow up appointments on a one to one basis about 2- 3 weeks apart. It was all exercise not 'cracks' no massages, just exercise. I haven't been back for a year and my back hasn't been this good for 20 years. The chiropractor I worked for was very charismatic and American in retrospect that was the secret to his success with patients. Honestly, physio is best especially if you follow advice and keep doing the exercises.