Rear-ended at stop by a large SUV. Subsequent pain & spine changes after chiro visit. How to handle?

I was+ rear-ended (fender-bender) while at a complete red-light stop when larger SUV on approach rear-ended my vehicle. At fault party insurer accepted full liability. Subsequent required care was received with ultimate follow-up to Chiropractor (MVA Medica Care for Rehab./Therapy Care). Reported MVA impact of pain & discomfort was identified in upper neck & shoulders including left side shoulder soft tissue pain/discomfort & spasms. However, the Chiropractor Doctor articulated that a neck adjustment was about to take place, however, immediately thereafter and unbeknownst - without warning applied excessive and extremely forceful (too forceful) blows - multiple forceful pressing down blows all the way down my spine (pressing down extremely hard, very strong and hurtful while pressing my spine) with subsequent shoulders and pelvic / hip bone thrusting forward type of force at the corners of both shoulders and pelvic, which have now created a highly unnatural and Previously Non-Existence curving of my spine, shoulders and pelvic/sacrum & tale bone area resulting in ongoing relentless muscle, movement & joint pain; extreme misalignment ramifications to address elsewhere.