It's possible you have a secondary thing going on and your dr is just looking at your symptoms as PD only and not investigating the why of the pain?

Often you can request an evaluation appointment first from most chiropractors and that should help you to get a feel for the knowledge base and experience of that DC.
If your neck/shoulders are problematic look for one that has upper cervical training also. {C1 & C2 adjustment}

This website gives a lot of info on chiropractic and the different types of it- explore the whole site-
http://www.upcspine.com/self.htm

CONDITIONS THAT RESPOND

Following is a list of conditions or diseases which have been reported as responding positively to upper cervical chiropractic. The reports are in documented case studies, newspaper reports, scientific studies and other materials, as well there are many anecdotal reports. This is not a complete list, as it seems endless the list of conditions or diseases which have responded to this type of care. What this really highlights is an absolute need to research this further. If there were a drug, which had the same affect it, would be hailed a ‘wonder drug’ and millions of dollars would be poured into its research and manufacture. Because these results are emanating from chiropractic all that the results attract are sceptics. Unfortunately, chiropractors have no where near the resources that pharmaceutical companies have and therefore until this changes research will not be forthcoming and patients will be relegated to accepting less than satisfactory solutions such as drug therapy and surgery. Pharmaceutical companies should not be subsidised by Governments for research, they don’t need it – chiropractic does.

* Allergies
* Arthritis
* Asthma
* Arm pain
* Athletic injuries
* Attention Deficit Disorder (ADD or ADHD)
* Back pain
* Bed wetting
* Carpal Tunnel Syndrome
* Cerebral Palsy
* Child development problems
* Chronic infections
* Constipation
* Depression
* Digestive problem
* Epileptic seizures
* Ear infections
* Eye infections
* Female disorders
* Fever
* Flu symptoms
* Frequent colds
* Hacking cough
* Hay fever
* Headaches (all types)
* Herniated disc
* High blood pressure
* Hip pain
* Hyperactivity
* Immune system deficiency
* Indigestion
* Infertility
* Knee pain
* Learning disability
* Leg pain
* Loss of sleep
* low back pain
* Migraine headaches
* Multiple sclerosis
* Muscle spasms
* Neck pain
* Nervousness
* Neuralgia
* Neuritis
* Numbness
* Pain (chronic)
* Parkinson’s diseases
* Poor vision
* Restlessness
* Scoliosis
* Shoulder pain
* Sinus problems
* Sore throat
* Tendonitis
* Tight muscles
* Tingling Sensations
* T.M.J. Syndrome
* Tourett's Syndrome
* Whiplash
from the page - http://www.upcspine.com/respond.htm