I have a relative who is hyper-sensitive to sound and describes it as very painful when particular noises occur. In her bag she has ear defenders, ear plugs, ear muffs, a handy scarf draped round her neck and will quickly cover her ears with whatever is handy when sustained noise starts to hurt and it makes her feel disorientated.
Not sure what you mean by 'real autism', Jingle? The majority of people on the autistic spectrum partipate in life like anyone else, but have to deal with obstacles that others don't think twice about.