Try to arrange an in-person meeting with your attorney to go over your concerns. If he filed a hearing request, settings often get postponed several times before the hearing actually goes forward, so this isn't his fault, but you may need to encourage him to be more aggressive in pushing for your hearing to go forward asap.
That doesn't sound like negligence, but more information is needed, of course. I would work with a local workers' compensation attorney to try and get a change in physician or pursue other options. I can assist if you'd like...despite being in Atlanta, I have cases in SE Georgia where you are, too.
There is no cause of action for "wrongful termination due to a workplace injury" in GA. It sounds like that's what you're asking, as opposed to a question about whether or not you can file a workers' comp claim, which you can do (and probably have done).