Relationship anxiety

Hi there!
I have a client who has anxious attachment in intimate relationships. She is engaged to someone who is controlling and with whom she had to set boundaries. Their boundaries are very different but she says but it's making him feel extremely anxious too.

Now every time she sees that he is not happy with her she gets into a fight or flight situation and can stay that way for hours until she gets a sign he still loves her.

We had a few sessions already:
- boundaries
- overall anxiety
- fear of abandonment

But she tills gets extremely stressed and anxious, so much so, it usually end up in a headache by the end of the day.

Can anyone give me pointers or ideas on how to work with her? I really need help here...

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