I know I am being unreasonable (definition of phobia!) but want to know if there is anyone else out there. A quick Google shows me this is more common than I thought and curious to know if anybody has found anything that has helped.
Since I was around 9 I have been unable to touch (or touched reluctantly/with immense disgust) small metal objects such as jewellery, coins, keys that aren't my own (although I will always pick up even my own keys by the plastic bit), etc. Although I have less need to encounter/touch other objects, it would be the same for any small metal object e.g. those display cabinets in antiques shops that are just full of random objects like tiny spoons = want to vomit. I will touch change to hand it over in a shop but as briefly as possible, and I then have to rub my hand on my clothes and then can still feel a 'sensation' where it touched for ages afterwards. If someone has left some change on a desk nearby at work or is say, messing with their ring taking it repeatedly off and on again, I can't concentrate and just want to get away.
I do have a general 'thing' about cleanliness so that's probably where it's come from and likely my brain has taken it too far and too specific - as there are all sorts of things I touch in a day which must have your regular amount of germs on (e.g. work keyboard, bathroom doors) with no problem.