Objective medical findings are extremely important for your claim. These are the findings that aren’t in dispute or open to misdiagnosis. The challenge for your doctor is to make the correlation between things like x-rays and muscle aches. Often it will be hard to connect those two findings. However, your attorney will be able to guide your doctor as to how to convey that information.
The best thing your doctor can do is to ask about your limitations. This doesn’t mean agreeing with everything you claim. They need to base their findings on their professional experience.