The first thing to do is immediately after an accident is without hesitation, go directly to the emergency room. If an ambulance is not called, then have a friend take you. If you take yourself, then the legitimacy of your physical injuries might be questioned.
While you are at the ER, be sure that you actually get to see a doctor and not just a physician assistant. If X-rays are not taken, request them without being stuck up or bossy. Also, be aware that you will be treated differently due to that most ER personal will not want to get personally involved in your case so to avoid a legal case associated with most auto accidents. So, having said this, you sometimes have to be insistent with your treatment because you may have a serious injury that could be overlooked.
The next thing to do would be to follow the recommendation of the ER physician who will more than likely tell you that if you are not feeling better within the following “x” days, you should see your personal physician.
Regardless of whether you have a personal physician you should make sure you see an MD as opposed to an OD or chiropractor whom are not taken as seriously by insurance companies. However, this is not to say that after you see an MD you cannot go to a chiropractor. If possible and you are suffering with a soft tissue damage and have intentions of going to a chiropractor, get your MD to recommend one to you so this conversation will go in your medical records. This will come in handy in the future when the insurance company attempts to say they will not pay because you are not seeing an MD or physical therapist.