I hate loud sudden noises. for me, the anxiety is in the abruptness and shrillness. I have a very sensitive startle reflex and ….at extremes…. have been known to scream or run if I am already anxious and stressed and have been so for days. I learned young not to ever ever startle my dad. I once stabbed myself in the ribs with my car keys when startled on purpose by my ex’s roommate. that was so mean 
. I hurt for 3 weeks. I can’t watch horror movies in the theater due to my startle reflex. I am not scared, but hate the purposeful startle effects. so yeah. no halloween haunted houses..ever. I always dislike loud noises, but my startle is mild when I am in a relaxed state.
as far as I have researched, the startle is more of being in a baseline anxious state (ie having an anxiety disorder). most prominent in generalized anxiety disorder and posttraumatic stress disorder. I think an ADHD sound aversion thing is probably closer to being unable to filter sounds which don’t matter…or possibly at times being distracted from moments of hyperfocus. in general, i think my specific dislike for loud noises is more due to generalized anxiety versus ADD.
during nursing school, i had a huge problem with drowning out beeping monitors (unless it began beeping with me in the room) lol. I recently filtered out a fire alarm at work until a colleague ran into my office and told me to get out. that thing was not nearly loud and shrill enough. a steady non-abrupt shrill noise will either be completely ignored or will piss me off. flip of a coin.
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