This was also me, except mine turned out to be my job (low-level manager but lots of stress and responsibility).

I used to have at least one ‘attack’ a week, sometimes several, seriously affecting my social engagements (because - naturally - I was usually completely fine at work and it was only my personal life and relationships that suffered).

Once I was out of that environment it stopped pretty much straight away. Amazing and frustrating at the same time; I wish I’d realised sooner!

Edit: typo