vonny, Worrying for me is not a habit. It's in my nature.
Izzie, I smiled when I saw your name here. Querida, worrying and kvetching are two very separate and distinct things. I doubt that I'll ever truly stop either. Kvetching is a particular kind of complaining. Worrying is stewing, fretting, etc.
I said the following on these boards a very long time ago. I think it's worth repeating now.
If kvetching were an Olympics event, there's no doubt I would win the gold. And as I accepted the medal, I'd be worrying about falling off the victory platform and kvetching that the medal wasn't 24 karet gold.