While I don’t have panic attacks as such, I very much do have those feelings of feeling “unsafe and untethered” which you describe @Goldfinch.
I think, for me, it’s to do with feeling alone/on my own - not loneliness, but just that feeling that everything to do with my home and my life is now all down to me.
The burden of responsibility is now a one woman show where previously it was a tag team.
I’m living on my own for the first time in my life.
That very strong presence of the man that always had my back no matter what, has suddenly been whipped away and there’s nothing in it’s place.
(My lovely husband died suddenly and completely unexpectedly too though, I suspect a lot of these feelings are common amongst the bereaved regardless of the circumstances of the death).
I do think with sudden, unexpected deaths, there is a huge amount of shock initially which can make us feel numb ,then, as that gradually wears off, reality sets in and that feeling of fear/terror/anxiety takes over where the numbness left off.
Again, for me, the untethering is compounded by all the admin things we have to do as we sort our loved ones’ affairs.
What used to be “our” bank account and cheque book, is now mine.
Similarly, the house, the car, savings etc etc.
It feels to me as if I am sitting in a tent and one by one the guy ropes holding my shelter are being severed and my lovely husband is gradually being erased and at the same time, I am becoming increasingly exposed in some way.
I manage my fear by concentrating on what I have to do rather than focusing on the fear itself.
I don’t always get things right - I frequently get things wrong but I just tell myself it doesn’t matter in the scheme of things because the worst thing in my world which could happen, already has and I find that the more I do, the more I’m able to do.
Maybe some professional help would be beneficial for you @Goldfinch, if your fear has you trapped?