every months or so i have this felling ... things get really loud i fell this screaming sensation and i get scared really fast. I cant really hear the scream but i can feel it ... even dead scilence has a sound. They uasuly only last from around 10 -20 minuts. And then are gone ... i do not hear voices and in the end i'm fine ... while its going on i feel really really scared . could this be schizophrenia or a panic attack or somthing totaly different?