It may be best to have someone drive with you so that you have some support. I know that they can't go to the appointment but you need some support. If not, lots of reassuring phone calls along the trip. I hope that you get through this ok and get the job that you are trying for. Best of luck to you and God be with you.
make a list of things you need for your trip and write down any questions you have for your doctor and let him know about your history and any meds you take ok :)