I have emetophobia which got really bad during my teens and twenties. It's not as bad as it used to be but back then my whole world just revolved around it and there's nothing worse than being literally terrified of something you just can't avoid no matter what. I had to get many surgeries on my ears in my teens and I was more fearful of post-op nausea than I was of having a mastoid infection. But I was actually good at fighting it, or the anesthetics used now are less emetic than they once were.
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I hate it when people complain about wrong it is to throw out food, because I would rather throw out anything that I think is the least bit out of the ordinary than risk food poisoning, and every week it feels like there's another headline about listeria or salmonella in a food product. When I was around 12 I read about botulism and became so scared I nearly drove my parents crazy because I thought anything I ate would kill me, canned or not.
I've decided to avoid canned tuna, one of the few fish products I can tolerate eating, because of mercury.
Sometimes I hear loud noises late at night when I'm dropping off to sleep and I think oh god the world's ending but I know it's probably just an airplane or the snow plow in winter. But what's really bad are the idiots who drive their motorbikes at that hour or race their cars. I've been jolted awake feeling like I'm having a heart attack just from the noise, and I probably really will have one some day. Arrrrgh!
Large, barking or just generally unfriendly dogs. Even if they are friendly experience has taught me they can go to being very UNfriendly in a split second, sometimes for no apparent reason like the dog we once had who turned on my mother suddenly although he wasn't vicious around the rest of us. Perhaps she physically resembled someone who was cruel to the dog, or maybe it was because the dog had been hit by a car, and lost his tail as a result. I read that dogs who lose their tails or get them bobbed can become aggressive since they normally would use their tails to communicate and are unable to.
Cars. Vehicles. Wheeled coffins of glass and steel. Having to cross a busy street. I grew up in the country where we had no traffic lights because we didn't need any. In fact it wasn't that long ago the road wasn't even paved, according to my mother. So the first few years of my life in the city crossing any large busy road was terrifying. I'm more used to it now, but I still think cars turn people into maniacs. Just the other week when my mom and I were on a trip we were on a highway and she mentioned how all the other drivers were at least 10km over the speed limit and that she herself was going over 5km. I guess it's not that big of a deal unless the roads were wet or icy, but it was just a reminder of how people think they have to drive like they're in a race, thanks mom.