You need to at least attempt to return to work. If you go back to work and your symptoms increase to the point that you can't continue, let your supervisor know, then return to your doctor and let your doctor know what happened. If you don't have a good relationship with your doctor, consider changing to a new doctor. You do have that right.
You should also consider getting a free consultation with an experienced workers' comp attorney. You can find one on this site, or at CAAA.org, the organization for attorneys in California who represent injured workers.
You return to work, or you retain an Attorney to have you evaluated by a different doctor.
We offer general concepts, but you should give ALL your facts to a licensed Attorney in your state before you RELY upon any legal advice.
GET a QME to challenge the findings of the Treating PHysician... that treater is clearly a complete waste of time (and likely 'in bed' with the adjuster and is not going to write your injury has left you unable to perform this job).
YOU STAYED with that Jerk Treating Doc too long to change. Once the Treater declares you MMI, you're sort of 'married' to him... you can't go 'shopping' for a new treater for a new report.
ALL YOU GET NOW is a Qualified Medical Evaluator... and most of the docs popping up on the list are from a group in based in Fresno who magically find every hurt worker is magically healed and only has about 3% disability and can perform all regular duties, no matter what the injured worker reports as pain and inability to stand and lift.
SO IF YOU APPLY FOR THE QUALIFIED MEDICAL EVALUATOR PANEL...do not pick the doctor by yourself. If you pick another jerk, you'll get virtually nothing. Either have an experience comp attorney pick the QME from the list for you or carefully and thoroughly research which docs are 'in bed' with insurers and which are independent and truthful.
Sounds like your doctor may not be providing you with great care. You can switch doctors, get second opinions, or seek an evaluation from a qme. You re not stuck with the doctor your employer or insurance company sends you to. I would recommend that you get legal representation. A good attorney can refer you to a reputable and compassionate doctor.