Wow, that doc
I got some of my records once and they were not very legible or concise either

I would make your own notes per date as best you can recall.
I'd be curious how his billing was coded, maybe the codes covered what some of the appts were for.. That should be on the billing statements.

Have you considered an expert chiropractor, perhaps you have some misalignments from the MVA?
Sometimes a good one can help more than MDs or PTs..
Some also do PT type modalities like ultrasound, IF stim, massage, triggerpoint work, and some have soft lasers..