I experience what I think is hearing hallucinations when anxious. My neurologist called it Hypervigilence, but the online description of this condition does not match my symptoms. I occasionally see a flicker in my peripheral vision, also like someone walking past, shadow-like. What is this? I have abnormal, though not epileptic, brain activity, possibly due to my Cerebal Palsy. I also have Hypnopompic Hallucinations, also known as Sleep Paralysis. I hope this extra information is helpful. Thanks, Alison