Okay this sounds extremely insensitive like I have no empathy, however, please hear me out.
Anxiety is a natural human emotion and I get that when someone is anxious you can snap at people, be abrupt and look like you're in a bad mood. I've done it myself.
BUT
Where do you cross the line from me being anxious and irritable with people to demanding everything revolves around me and blowing up if someone does something that makes me anxious?
I have a family member who has anxiety and they are extremely demanding. The anxious stuff is always something not to be anxious about. They are rude, angry and expect everyone to do whatever they need to reduce their anxiety even if it comes at a cost to themselves. I just feel it's given them a licence to act like a dick with people. There's never any apologies after. If anything they think people should know better and know exactly what they should and shouldn't do.
It's utterly exhausting and honestly I feel like I'm tiptoeing around them. I actually limit how much I see them as more interactions, usually more chance of them getting mad at me for something I didn't even know would get them mad