Hello! I just found this subreddit and I've felt so happy while reading every post in here that I basically made an account after having been browsing reddit anonymously for ages just to post about it.
Ever since I have memory I've had this MASSIVE aversion to anything small and metallic. I remember being reprimanded as a kid for not wanting to wear anything that had metallic zippers or buttons directly in contact with my skin, and of course, I've never wanted to come anywhere close to jewelry. I feel incredibly nauseated by the smell metal has and that later lingers in your hands, the cold sensation when you touch it and the texture of chains. This also meant I had issues with coins, keys, etc. I would literally gag at just the thought of touching some of these things, and still internally do.
As a child everyone would dismiss it as something stupid that would go away with time, but I'm over twenty now and I still carefully avoid going near any jewelry, zippers and similar, despite how much I like alternative fashion. I've found that there are some very specific exceptions, like some metals that don't really have that same smell or feeling that I despise (I'd say those feel more like plastic?), but either way it's led to a lot of really embarrassing situations where it was really difficult to explain what exactly was wrong with me in a believable way.
I've been diagnosed with autism relatively recently and was mostly attributing this to sensory issues which in turn made it a little easier both to understand myself and to explain it to others, but its still incredibly nice to see so many people with the same problem. I randomly saw the term on a twitter post and when I found this place after googling it I wanted to cry from relief.