Almost any kind of novel traveling with exceptions.

E.g. taking the bus to/from work: fine, nice even.

E.g. driving to a shops: fine.

E.g. going on overnight holiday with family to visit other family: unreasonably irritable and cantankerous.

I would say when there is nothing, your body is just misfiring for no apparent reason

A few years back I was having recurring panic attacks, and my body’s “fight or flight” would kick off over the slightest thing, or nothing at all.

At the time I was keeping a sort of “panic incident journal” to try and track any potential causes etc. This is one of my favourite entries:

“I am oversensitive - a stair creaks and I am fully alert and prepared to defend myself from inanimate objects”

Aside from that, I wouldn’t even know where to start with listing all the silly minor things that cause disproportionate increased anxiety in me.

Changes in barometric pressure.