My fiance has anxiety and I am not helping, what should I do?

My fiance has anxiety and she is newly diagnosed I am under a lot of life stress and I am trying to get out of a long time stage of depression.
When she feels anxious, she starts following me on every step I do, and we start arguing, then she starts mentioning old stuff that makes me angry then it ends up breaking, don't know how to deal with her. I love her and I want to be with her in a good turn it happened once and now it has started again
Please help what should I do?
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She start with taking madics, but I feel she is acting different than I used to know her , she less care, not calling me she used and when she is feeling anxious she calls her sister instead of me
My fiance has anxiety and I am not helping, what should I do?
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