Should I appeal the decision to stop coverage of a injury sustained in an auto accident, because of their IMEs statement?

My occupational policy, has stopped all coverage for a back & neck injury sustained in a auto accident. No medical coverage ot TTD payments now. I was injured 3/10/12 when a drunk driver hit my truck. and have been off work with low back & neck pain, since. In september I went to a IME who reported that my low back was healed to a pre accdent condition as of July 31st, and since my neck pain did not present until 2 weeks after the wreck it was not related (it is a illness not a injury). I do have slight degeneration of the spine, discovered by ct after accident, but had no pain associated with it. The IME filed 3 adendums since Sept. and declared me ready to return to work in Feb. They since cut off all coverage based on this report. What should I do now?