Hmmm hypervigilance for me is interesting. Mostly exhausting. I'll give some background so this makes sense. Dated a psychopath, made people close to me believe him and used them to hunt me down and try to do things that end my life prematurely. So, I've had to move a few times, change my name etc. That being said, I'm always hypervigilant for scanning for people I know, cars I recognize (almost got plowed down once), people recognizing who I am, any person with a gun or weapon, charismatic individuals, any male, being alone with anyone, trusting people (anyone can turn), darkness, and people touching me. I also never fully unpack anything, and am ready to bolt at a moments notice if I see anyone resembling him or someone I know. I always have an emergency bag packed in case he walks in the door with guns. Phone calls are the worst at work, I think something terrible happened. Also people finding out I'm lying to them about things, or not trusting me. It's a fine line between authentic and fabled for me, just enough truth to be believable, but no details because then I have to lie. I have a trained sweet mask to answer people's personal questions so they won't be suspicious.
When I lived in the same town as my ex, I shut down emotionally, and had adrenaline pumping the whole time. I'd see him stalking me to school, and I'd always be around people so he couldn't get me alone. I wouldn't spend a lot of time near roads where he could see me and quickly kidnap me in his car. I'd stay near one though in case he was on foot so I could run out and grab someone's attention. I'd also peek around corners, hide at a moments notice. I like to go completely unseen. I'm also able to walk without making sound, and always dress in clothes I can run in, or survive a couple days if I have to. Also pepper spray, and stuff for survival like first aid kits, rope etc. are always on my person. I feel naked without it. I was also afraid of having roommates because I didn't want to endanger them. Also being friendly, nice and cute to everyone so they'll like me and help me, or completely withdrawn and hidden so they don't remember me or see me. I watch my electronics so they don't get hacked, and never have location services on. I'm also not on any social media. I've thought about not having a smart phone anymore. When I was in the same town, a few months ago, I was just surviving and just super stoic so I could focus on everything around me. I'm queen at ignoring things, working with extreme adrenaline, and having a complete non emotional mask if needs be to get people to not see me. Totally believe people can sense emotions, and they become aware of a hop in your step, a smile on your face. I use those to my advantage, or don't use them to remain unseen.
I'm very aware of people's emotions. I'm always trying to calm them and soothe them so they don't go berserk. But I'm also not afraid to stand up for myself and fight if I need to. I can go berserk too if I need to. I make sure people don't see me as someone to be walked all over. I can't stand angry people, I shut down completely. If anyone yells it's game over for me. I'm gone. Cold people, I run like mad away from. Can't deal with psychopaths. Always scanning people for who they are as a person and if they can be trusted for however long I'm supposed to interact with them.
I'm much more relaxed now that I'm far away from all that with a new name and everything, and I'm getting used to it, but seeing people who resemble him, my feet start walking on their own and I'm out. Can't do it. Lots of things like that I guess. My body just moves on it's own a lot to protect me. Oh also, I don't feel pain as much. So that's a thing too, just shut that off completely sometimes. Meh. I'm actually able to be happy now, and can semi-relax around people so that's a plus! Things are getting better. There were probably a whole lot more, but I honestly don't remember much because I blacked out so much before. I like people now, I like all their little quirks, they're adorable. So hyper vigilance has been helpful in a way, because I really notice all the fun, quirky, good traits about people too. Then I know who to avoid who scream "danger", or maybe not scream but just mildly too.
Also wherever I am I have an exit plan. I scan the room, and find the quickest way out. A weapon if I can if an attacker comes in. Also if someone is picking up on my danger signs, I figure out the best way to incapacitate them. If someone is being a cruel jerk, I imagine all the ways to... well I'd rather not write that one down. Suffice to say I am willing to protect myself and others. I like people, love them to bits, I don't like monsters. That was all rather discombobulated, but there you go.