losing memory and don't know why

so i keep losing memory of what happens. not constantly, but at certain times I will continuously forget what happened in the last 5 seconds to a minute, then I gain consciousness of that fact and start having a panic attack. this mostly happens when I'm at school or at a place that has like white walls or looks like some kind of office. it usually helps to listen to music, it puts me at peace, my heart rate goes down, and i remember stuff again but I recently lost my headphones and I just wanted to ask if there is another solution to calming myself down when this happens. i am planning on getting some new headphones but I need a solution in the meantime because I can't bring myself to go back to school until I either find another way to cope or I get my headphones. it is really embarrassing because this keeps happening in public and I know I look weird and that just freaks me out even more and worsens the panic. i can't put my finger on anything else that might be triggering it other than office-looking environments. i think its important to mention Im only 14. I do not think I have dementia but I am autistic and feel this is related to that somewhat, might not be idk.