I can be really pedantic about safety-based rules but feel put-upon if I'm expected to adhere to a rule that makes no sense or is redundant. I'll ignore those ones if I can get away with it.
Obsessions - they can last from a couple of hours to many months. In my late teens I bought a guinea pig. A year later I had 140 of various breeds, was heavily involved with a local club, and had shelves full of guinea pig-related books and a brain full of guinea pig colour genetics. When the obsession passes it's gone. I can't look at it again. My current one is reading about AS and getting a diagnosis (and ongoing ones to do with listening to a particular band and reading books by a particular author, over and over and over).
As a child I took apart all my brother's cars to see how they worked (and to fix them when they broke). I took dead animals apart too, for similar reasons. I had a great collection of skulls and things in bottles at one point.
I tend to speak slowly and somewhat hesitantly because I'm weighing each word and trying to work out what the other person's response is likely to be from the bank of possible responses that I've compiled. I often change my mind mid-way through saying a word so it comes out as gibberish, then I feel awkward and stop talking.
I don't like being touched. I've attracted a few hard stares when out and about for shaking off my youngest child and telling her to just walk beside me instead of trying to hold my hand. Agree with light hand-holding and uninvited touching on the head being unbearable.
Faith, I used to be a nurse too. It's funny that I was able to cope with touching in my job, maybe because it was me in control and touching them and not the other way around? When I was in hospital a little while back a young nurse grabbed my arm to steer me while I was walking to the bathroom (I wasn't unsteady, she was just being patronising). I felt like hitting her.
I don't know about stimming. I've always bitten my nails, and when I'm being good and not biting them I endlessly run my fingertips along my nails looking for irregularities. When I'm really anxious I roll my fingers against my palm like I've got invisible worry balls.
I can't do eye contact. I watch people's mouths as they talk, or that bit between the nose and the top lip. If they're staring and I'm really uncomfortable I'll look into the distance or at some object off to the side, or down at my own hands.
Auditory sensitivities, including a heightened sensitivity to unexpected sounds. I sometimes imagine myself a deer, freezing and trying to pinpoint the source of a sound before deciding if it's safe to move.
I usually have bruises somewhere on me that I can't remember getting.
Small talk - can't do it, don't see the point.
I hate competition. It seems a pointlessly cruel way to conduct oneself, because there's always a loser.
I get overwhelmed by too much activity around me. I can't drive in the centre of my city for that reason.
That's just scratching the surface but I just realised how long this post is going to be so that will do.