Hi MMAQ, nope, no superhuman powers, though I can see three times more detail than other people can, somehow (a good number of us have vision that seems to work the same way as birds of prey rather than people, so we can pick out the tiniest details in a scene/see the whole scene at once to look for what's wrong or different...but not necessarily know what to do with the info). I can look at a work of art and tell fairly instantly if it's a fake, for example, without having to go through all that paint-testing malarky.
Anyway, your question is a good one. I'm going to generalise because everyone is a little different and not everything applies to each person...
Over the decades I've learned how to minimise exposure to sensory stuff, and how to take regular breaks from it, and how to explain my needs to others. If it's too much, I can now say so and explain why. But the sensory stuff doesn't go, and I don't mind it because (if I can control it) it gives me a lot of joy as well. Kind of like most of humanity hearing a well tuned piano but (in good moments) we can hear the whole symphony, I guess.
But the fear response is totally automatic as it's linked in via the amygdala part of the brain - the ancient bit that controls automated "hell, run, scary animal" stuff. It's like you trying to control your reaction if all of a sudden right now someone fired a gun in the room - your instincts are there to protect you. Ours help protect us from sensory overload, if we're allowed to have a choice about it. So, no, if I'm going to be scared, I'm just scared.
What helps is the prediction, which is why a lot of us thrive on routine etc. If we can guess which sensory nightmare is about to happen next, we can 'duck' 
None of it stops me having a lovely dh and ds, or a job I love, or enjoying my life, if I can be allowed to cope in the ways that fit with my brain design.