I'm wondering if getting an in-depth tour and being given time to play around with equipment and get comfortable in the space would help decrease some of the anxiety you feel. It sounds like you are already trying to give yourself more exposure to decrease anxiety, but I'm wondering if going a step further would be helpful?
I have a family member who works in a simulation lab and loves to show off the mannequins and the simulation space. All a student need do is ask and he's happy to set an appointment up to give them a full tour, including allowing students to poke through cupboards, experiment with the equipment (supervised), show off the inner working of the mannequins, take them back to the control booth and show how the audio works, etc and answer any and all equipment & technology related questions to help students feel more comfortable with the space and confident in their ability to find and operate equipment. Do you think the simulation staff at your school would be open to something like this?
Alternatively - is it more of a difficulty "pretending" and phobia of acting (or preforming in front of others) that are driving your anxiety? In this case it may help to spend time acting situations out at home - with family or friends just to stretch you acting muscles so it doesn't feel so awkward in clinical.
Depending on the level of anxiety / panic you are feeling in simulation it may also be appropriate to seek out assistance from your medical provider and/or a therapist (student health could be a good place to start) to address this fear.