You may wish to switch the appointment from an exam to a consultation. The difference is that the latter allows you an opportunity to discuss the situation with the AME without putting your future flying plans in jeopardy.
When asking for a consultation, not an examination,
If the AME or his staff ask you to fill out the MesXpress form (FAAa Form 8500-8), it is okay to do so. But be ware there is a way you get snaffoozled by the staff without you knowing about it.
At the bottom of the form when you complete it and print it is a confirmation number. If the staff takes that number and enters it into the FAA medical certification system, your consult just became a live exam. And a live exam must proceed to a decision. A decision of issue, deny or defer.
To avoid the snafoozle, take a pair of scissors and clip off the confirmation number. Put that in your pocket. Now the AME has the info, but no way to open your file on the FAA system.
Proceed with consultation ask your questions, get the guidance, and write down your notes.
The end of the consultation should result in one of two outcomes: (1) the AME says he has enough to issue your certificate right now; or (2) The AME educates you on the requirements and provides a list of things to obtain and bring back for the real exam.
He should also tell you if this will be an in office issuance or a situation where the FAA requires it to be a “deferral” because the issuance decision must be made at a higher level. If deferral, do find out if the AME will go above and beyond as your advocate to make sure the application doesn’t get hung up in channels