I think it is much about what helps you as a person. If I feel anxious I actually refrain from touching anything. I am oversensitive to touch and adding anxiety, the touch signals will very quickly overload my brain. I will then feel it as if the thing I'm touching isn't really real.

I have no emotional memory so I can't think of happy memories, I can in theory know if I was happy at that time but I can't recall emotions from the past.

But incense sure... although I tend to burn it all the time, LOL. I have a bit of an autistic mind but yea repetitive things can calm me, like bouncing a ball off the wall.