I can not even imagine trying to get through a panic attack with an argument on top of it...wow!
I would strongly suggest counseling or therapy or both, there are hurtful and damaging things being said on both sides. It is so hard for a person that has not experienced anxiety that leads to panic to relate to what is happening or how it feels.
Doesn't make a significant other a bad person if they can't totally understand it, but there needs to be compassion. If at some point some of the issues don't calmly get worked out, it could spell real trouble for the relationship.
These are your words " I have been saying this same old stuff for over a year." whatever the issues are, the method of resolution is broke.
Good luck to you both and I hope you two can figure out a way to make it better.....best wishes....WM