SlumberKitty, you can exercise a lot of control over the procedure. Your friend can stay in the waiting room. You can tell the nurse to stop at any time. You can tell them to go slower, to stop, to show you the equipment they use. You can breathe through the experience. You can be an active participant, don't let them bluster through you. You can try this time, not finish the test and try again at another time. Take security items with you, essential oils, a blanket, a donut, a bottle of whisky.