We have a real problem with Physician's Statements from doctors who are too busy to spend time writing them and unwilling to go out on a limb to say it like it really is. So you have to work around this.
When it comes to doctors, you have to figure out how to get them to sign off on a Physician's Statement that is crafted with them. A doctor has 20 minutes for you, and you need more time than that. So you need to convince them that it is in everyone's best interest for your lawyer to assist them in writing a statement that explains your symptoms, relates them to medical evidence, and persuasively argues that your condition prevents you from performing a critical element of your job.
Just like visiting a doctor with a list of your symptoms, it is important that you go to your doctor with a list of what needs to be in the physician's statement.