Yes. A doctor you see to treat your injury has much more credibility than a hired witness. It is important to seek out medical help as soon as possible after any kind of accident or injury, especially for a personal injury case. If you wait too long, you may lose credibility, even when you have legitimate injuries. 
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After initial treatment, you should also continue with all recommended follow-up appointments, rehabilitation, and other treatments. Strictly following your medical care provider’s instructions helps you to maintain your case. 

A final consideration is your doctor’s reputation. If you can, avoid doctors who advertise for their role in personal injury cases. Any suggestion of a conflict of interest can affect your case.