I think acupuncture is way more legit than chiropractor treatment.
I don’t know much about it, seems I always see it mentioned as alternative medicine. To me, that sounds like not-medicine.
One of my sisters had a sideline gig hypnotizing people to quit smoking when that was a new thing. She actually believes in it because it worked for her. She had a hard time attracting customers at first until she checked out some successful hypnotist offices. She followed their method and added crap like incense and blinking lights etc. Boom, more business than she could handle. She did it for about two years, made a pretty good chunk of change that all went into retirement accounts. She still believes it works. 
A person comes in complaining of neck pain or facial numbness following a recent event. The first step is to make sure their airway, breathing, circulation and vitals are okay, anticipate if they might get worse (so need assistance breathing or address cardiac or airway issues), start IVs, listen to their heart, lungs and do neurological and vascular exams. Decide if they need their C-spine immobilized according to clinical rules and/or provocative tests. Airway equipment and adequate help should be at the bedside.
They will need gentle pressure to reduce active bleeding which should be confirmed with imaging - depending on stability - ultrasound in the ER, C-spine and chest X-rays, CT neck or other studies as indicated. They need basic baseline and surgical bloodwork and probably blood reserved if transfusion or surgery may be needed later. They would usually receive some intravenous fluids and medicines for pain or anxiety. One certainly cannot assume there is no ongoing bleeding if one does not know. Their medicines and allergies would be reviewed, looking especially for blood thinners, blood pressure and cardiac meds, things suggesting other conditions, etc.
A tracing of their heart (EKG) is required. The neck should be examined carefully, palpated, and auscultated for crackles and free air suggesting esophageal involvement. One is anticipating possible surgery, requires an expert opinion on this, and the patient should not be allowed to eat or drink.
If the problem is that an artery is split - so blood is going through the wall and down the wall instead of just the centre of the pipe - this puts them at risk for blood clots, a weakened artery, bleeding and nerve involvement and possible airway compromise. They will need medical management of blood pressure and possibly an opinion from a thoracic or vascular surgeon for management or possible procedure. Things may or may not improve with time. The patient requires admission to a high level of care and may require urgent transfer if these services are not locally available.
Much depends on the specifics and experienced clinical judgement. As good a history as you can get and managing the family is always important. Smaller places may just have a general surgeon, some symptoms may benefit from a neurology or neurosurgery opinion. If the patient arrived by ambulance chances are good their neck is already immobilized. The ER ultrasound may include looking for hematomas and clots, carotid pulses and an echocardiogram of the heart.