You might contact or read on your state website - wc division - to find out how cases in this sort of situation are handled.

and is your treating dr one of your choice or assigned by the employer/wc carrier? {MCO}

you should be able to change to a dr of your choice
{check your state wc site or ask atty}
- or if your wc atty has a good referral.

You need a dr that is really on your side not the wc or employers side.