She doesn't sound like a very good partner if she acts in such an immature manner.
Many people don't understand the complexities of what we have to deal with. I know I remember thinking about anxiety after seeing people have attacks "Can't they just control themselves?!" Then I had some attacks and I full sympathize. I wish there was a simulator that people could engage in to see how bad it may be.
My fiancee used to not completely get it, but I found that it was due to a lack of communication. I told her I didn't feel well, but it wasn't until I described WHAT and HOW I felt that she understood a bit better. I tried to find common ground for her to associate with, so I told her the physical manifestations first (Chest tightness, for example), then went on to tell her how it affects me psychologically/mentally/emotionally. All she wanted from there on in was to be informed about the doctors I was seeing and such. She was more upset that I didn't clue her in to what was going on with me, so now I tell her everthing and how I feel and she is much more understanding. Once in awhile she'd get upset because all we'd do was sit around and watch movies and TV since my house was my "safe spot," but she's gotten better and more understanding. And that's one reason I proposed to her.
Maybe sit down with her or even take her to a therapist with you since they may be able to explain it to her better.