Ever since my T started, I've also had distorted hearing. When somebody says anything with an "S" it makes a high pitched whistle that sounds too loud and stretches out too long compared to what I hear in my good ear. I get the same high pitched whistle when I breathe through my nose. Low pitched sounds sound pretty much normal. It has not interfered with my daily activities. However it makes masking my T almost impossible, because it is around the same frequency. Does anyone else with hyperactive have these symptoms?