Scheduled for a stress test

Well, I am scheduled for a stress test early Friday morning and I am scared to death. Don't know why, I am not even sure what they are going to do- sounds partly like they are going to give me medications. I am just nervous and having a bad day and more testing isn't helping. I am still having some chest pain or discomfort whatever you want to call it, it started up again this morning- I don't know whether to ignore it or what- it scares me. I almost wish that they would find something.