You should always listen to your doctor when it comes to treatment. If your doctor says continued treatment is medically necessary to improve your condition, you should continue receiving treatment. We can only give you legal advice; you have to find a medical professional you trust and take their advice.
If your condition is not improving despite following your treatment plan, you should speak with your primary care doctor to see if another form of treatment is needed. Everyone is different, and some people respond better to different treatment regimens than others. For instance, some clients have initially seen a physical therapist, but then found greater success seeing a chiropractor, whereas other clients have had the opposite experience. Keep in regular communication with your doctor so they can recommend a change if it is needed.