Another thing occurred to me, OP, by the way you talk about being the 'family worrier', like it's the same as being the family budgeter, or the family cook -- don't fall into the trap of thinking that every family needs someone to do the worrying, as though it's a crucial chore. It really doesn't. It does nothing to effect outcomes, and it just makes your life much more difficult.
I think my mother is a bit like this, and the thing is that she has literally nothing real to worry about at all -- she and my dad are in good health and living in a nice house with a good set of neighbours and community networks, interesting hobbies and volunteering, they have four happy, functional, solvent adult children, etc etc.
I once asked her what she was worrying about when she made some reference to lying awake at night and worrying, and it turned out she was 'worrying' about my cousin (someone she might see once a year who lives in a different part of the country), who had just moved in with his girlfriend -- apparently what she was worrying about was that he'd moved in to her flat, and what would happen if she threw him out???

The point I'm trying to make is that she's so used to worrying that she actively looks for material to feed it, and it's no way to live.
(And my cousin has long been happily married to his girlfriend and they have three children. So that was a wasted 3 am worry if there was ever one!)