I have read all to many stories of people saying that this is all in your head. No, this is all to real and, unfortunately, there is no cure. It is a pain, quite literally, to live with. There are many things that can help, things that can even send it into remission for some, but it is still there. I would welcome the fact that he would like to come to the appointment with you. I would make it clear that time at your appointment is limited, that you are the patient that needs to use this time to its utmost use for your own needs and concerns. To ask about the things that concern you the most, to receive the answers to your own questions and to hear what plans the doctor has for you. If after you are done, then he may ask all the questions he wants. You need to put yourself first while at the appointment.
This was a response to a post that has since been relisted as "Ugh"
neurotalk.psychcentral.com/thread226560.html