I was diagnosed with GAD as a teenager, so I feel like this has to do with my anxiety and wanted to see if anyone here can relate. 

I usually think about what I'm going to be doing for the day and have certain expectations on how things are going to happen. When something spins out of my control and things are different from what I had expected, I panic.

It's really difficult for me to handle last-minute notices, change of plans or unexpected events in general. It makes me feel irritated and anxious. And depending on how big the change is, it can trigger bad anxiety attacks. 

The frustration feels like it's blown out of proportion, but I can't help it. I wish I was more flexible to change, because of course there are many things out of my control and it happens. But it's so incredibly distressing.