What triggers your waiting mode the worst?

I was wondering what events/routines trigger your waiting mode the most?

I can sort of deal with appointments where I have to go somewhere BUT if it’s someone that is supposed to come to me like guests or online meetings/therapists sessions it drives me NUTS. I trained myself to be on time. I will arrive an hour early if it’s an important appointment that you cannot miss. But If I’ll be ready earlier than I have to get out of the house, it’s also really painful.

Right now I’m waiting for a delivery guy who supposed to come between 12 and 11 pm and I cannot do anything because I can be interrupted or startled when he finally arrives.

When the guests are late or even if they’re coming closer to the evening until they show up my brain is on fire, in a way that I can’t concentrate on anything BECAUSE THERES FIRE HAPPENING. I’m also the best cook in my household so I have to plan all the meals to guests arrival time which is really fun for me too.

So what triggers you the most? If you can suggest any coping mechanisms, I would very appreciate it because Google comes up with basic advice my mother could’ve given me like “stop worrying so much”

Edit: here’s the kicker: they lost my order. The app says it has been delivered, but it wasn’t. The support told me they will try to resolve the issue and find my order in the next 3 days. I’m just…. Rggg! 😡😤