Fire Alarms & Autism Shutdowns

I'm a 22 year old university student with autism, anxiety and suspected adhd living in onsite accommodation, every week on a Friday they test the fire alarms to make sure they work on schedule which I can deal with because I know to expect it and it's over so quick however once a term/half term (not entirely sure which) they do a full fire drill where we're expected to exit as if there was an actual fire. The first time this happened I was in the kitchen with my friend and aside from being a little overwhelmed I made it out, however the second time they did this was Tuesday this week and it went awful. I was in my room alone and it went off, while everyone else went outside I was trapped paralysed in autism shutdown on my bed so all I could do was curl up, cover my ears and wait for it to end. Student services were aware of the possibility of me not reacting appropriately to it so I have a Personal Emergency Evacuation Plan (PEEP) in place however this didn't work. In the event of an alarm they are to come and find me in the house if I'm not outside with everyone else which we thought would be enough however this was a new experience for me so they came to my room and found me lying there but I wouldn't move. They asked if I was okay then told me it was a drill and they'd turn it off shortly which they did but throughout the whole experience and for an hour after I was trapped unable to move despite wanting to, so now we have to redo my PEEP form to try and make it work. It was a terrifying experience as I didn't know it was a practice at the time but I physically couldn't get myself to move and the idea that there could be a fire and I am trapped scares me more than ever before now. If anyone has any experience of similar things or what they think could help it would be really appreciated, I'm desperate and it could be a life or death scenario. They've said they can't tell me exactly when they will be as it will defeat the purpose but can tell me it will be on a Monday - Wednesday between 6pm - 9pm, I already have noise cancelling headphones next to my bed but I couldn't put them on because it was instantaneous shutdown however since I have ordered a second pair to put by the door so if someone comes in they can help me out. All staff members I've spoken to about it are unsure as to what to suggest and I don't know either because it's a new situation for us all but it needs a solution fast because of the emergency and danger factors.