Sudden overwhelming loudness

So this has happened a couple times and it has really freaked me out. So sometimes out of nowhere everything becomes so LOUD the scraping of a chair the clock my THOUGHTS everything seems sped up and almost unbearably loud it’s like someone turned the volume from 7 to 107! Everything starts to race and no matter if I count the holes in the tiles I count down from 100 I deep breathe I distract myself for whatever period of time maybe 5-35 minutes everything is so damn LOUD I haven’t told anyone and I’m only 15 but I’ve never heard of this???