Pretty much everything haha.
Once I'm actually doing the thing and enjoying it or did the thing and made it out the other side I'm a ball of nerves and anxiety.
But I'd say the biggest thing is doctors appointments. Although there are some doctors that I think I work myself up because I know they are going to annoy me by making me wait forever, ask me dumb questions, and then gaslight me into thinking either there is something terribly wrong and sending me for tests that turn out to be fine or gaslighting me into thinking nothing is wrong with me and it turns out there is.