When it comes to whiplash injuries you need to do the correct rehab as quickly as possible. A part of doing the correct things is making sure you don’t do incorrect things. Here is an exerpt from the MAA in Australia from their research-based booklet on the best treatments, neck exercises and things that they recommmend you do not do in the first 3 months after a whiplash injury.
Here they are:
Cervical pillows
The use of commercially-made contoured pillows is not recommended as
there is no evidence to prove their usefulness.
Bed rest
A period of bed rest is not recommended for people with WAD
Grade 1. People with WAD Grades 2 and 3 should not have bed
rest for more than four days.
12
Collars
The use of a collar, sometimes called a neck brace, should not be
prescribed for WAD. If they are prescribed, they should not be used
for more than 48 hours.
Spray and stretch
Spraying the muscle with a cold spray followed by muscle stretching
is not recommended. There is no evidence this technique works.
Steroid injections
Injecting steroids are not recommended for WAD Grades 1 and 2. Steroid
injections may be used for WAD Grade 3. Repeated steroid injections
may cause harm.
Injections of local anaesthetic or sterile water
The injection of local anaesthetic or sterile water into nearby nerves
is not recommended in the early stages of WAD.
Magnetic necklaces
Wearing a magnetic necklace is not recommended. There is no evidence
to prove their usefulness.
Pilates, Feldenkrais, Alexander Technique,
massage and homeopathy
These techniques are not recommended for the first 12 weeks.
There is no evidence to show they work during this period.
Whiplash-your most important protection against it
Stretching- Here is one of the worst to do
Which exercises should you do for a pinched nerve
The stretch you should not do for Neck and Shoulder pain
The Best pillows-What the Studies Say
About Me
Mark Perren-Jones has worked throughout the world’s health spas and health clinics. He did the majority of his study (7 years) in Australia and has treated thousands of clients over the past 20 years with all sorts of neck and back problems. He has studied acupuncture, massage, joint manipulation and mobilization, kinesiology, reflexology, Thai massage, Bowen technique and many other modalities to understand which therapies gets the best therapeutic results and which don’t for particular neck and back problems.
With his 20 years of clinical experience, years of diligent study and research Mark has put together this site so that you can benefit directly from his work. You will be taught not only how to treat your own pain but as importantly what causes your pain in the first place. With the knowledge you gain to remove the causes of your neck and back pain, means you will not have to suffer anymore. 
I have my new DVD out now which will show you in my easy 3 step approach how to alleviate your own neck pain.
Neck pain and especially stiff necks are not difficult to treat once you know how ( ie.remove the major causes of your neck pain and stiffness.)
I will show you how simple it is to treat your neck pain & stiffness both quickly and easily.