Prednisone, used long vterm, will cause deterioration of the cartilidge, so it should be used judiciously. That being said, on a short-term the benefits outweigh the risks. Some physicians may recommend a less intensive steroid protocol.
In addition to range of motion, avoid "up-and-down" vibration. Get an inflatable cushion to put under your seat ahen you drive.
Isometric exercises to strengthen muscle tone are useful. Put a hand against your forehead and push forward for ten seconds. Take a break. Do ten repitions. The put a hand against your left temple. Force the skull to he side to tense the muscles for ten seconds and release pressure. Ten repitions. Same with right side and rear. Twice a day.
Muscle relaxants are commonly prescribed, but they degrade muscle tone, so they are not a good idea.
Usually these complaints show up months after the initial incident.
You may have to keep the portable traction device handy and use it for years whenever there is a re-occurance.
You have a classical subluxion injury, taught in the second day of witch-doctor school in the smallest villages in Ouwakadugu. Often there is a co-factor, such as a bit of arthritic degeneration..
It's going to get progressively worse (pain city and a frozen shoulder and a walker and cane) unless you start treating the problem properly.
I hesitate to criticize, but your treatment protocol leaves something to be desired.
You have a classical subluxion injury and need to find a physician who knows what he is doing.
A cervical collar is contraindicated. It will cause loss of muscle tone.
An EMG is rather pointles/meaningless. Prednisone alone won't do anything.
The pain dermatone defines the pinched nerve.
First keep well hydrated and keep glucose levels down. No big meals. High glucose levels increase osmolality and impinge on the nerve.
Absolutely positively no vibration therapy or ultrasound therapy.
You need axial traction as of yesterday. Plus the steroid. Prednisone is usual. This is a common protocol. Start with 60 mg. Then fifty. Then forty. Then thirty. Then twenty. Then 10 mg a day for the next month.
Prednisone alone without axial traction will do ungotz.
Short sessions of perhaps fifteen-twenty minutes separated by an hour or two to start. The axial traction devices can be purchased without prescription for about $35 (U.S.). For the first week of this obviously you can't work.
In addition to the prednisone first two days 800 mg Ibuprufin in two divided doses (400 separed by 12 hours) with food. Then 400 mg a day in two divided doses for three days. Then 200 mg a day for the next month. That's only a suggested protocol. Consult your physician before taking any medications. My girlfriend tells me astrologers are also helpful.
Set it up so you can gently lower yourself, but not hang, providing firm upward axial traction. Discard the water bag.
After two weeks of axial traction therapy you need to begin "range of motion" exercises, rotating your head 360 degrees through the limits of pain.
You have a tort action in regards to the accident so consult a good bottom-feeder and be sure to document your medical history and keep going to a physician.
If not treated promptly an injury such as you have can cause a lifetime of chronic level-ten pain.