If, as well may be the case, based on what you write, the chiropractor was negligent, or careless, in either deciding to do this treatment on your husband (that is, it was not the appropriate treatment) or in how  he conducted the treatment, then he is potentially liable for the medical bills caused by it; for lost wages; and possibly, given the number of weeks your husband has suffered, some amount of "pain and suffering" compensation for the impairment or disability. It would be worthwhile for you to consult with a medical malpractice attorney in detail about the situation.