hi AnxietyMaster

It would be best to tell the psychiatrist about your issues because she will need all of the information to give you the proper treatment. There is no need to be worried about this as they have heard absolutely everything you can imagine. It is unlikely that she would want your mom in the room, and if she suggested that and you didn't want that then that would be out altogether.
The difficulty with psychiatrists is that the great majority of them do not do therapy to give the skills to manage symptoms so you might like to consider going to a therapist for that. I hope and pray all of this will work out well for you. God bless and best wishes from your friend Francis