Sorry you're here mate. I just thought I'd chime in and offer some support for you. Some of the aspects of your sitch rang a bell with mine, especially regarding this happening on a milestone birthday. Is your W into horoscopes or numerology by any chance?
It sounds like your W is a lot less aggressive than mine though and I'm glad to hear her anger has abated. I found I could tell how bad it was by looking into my XW's eyes. Do not fight the anger if it comes out of her, just do all you can to validate her feelings (no matter how crazy they are), and leave if it gets bad. Don't try to defend or justify either. Just listen.
FWIW I took my ring off after a few weeks. I didnt want to, but I had this weird feeling of embarassment and shame, like XW was scorning me for leaving it on after the hammerings she gave me.
Anyway, good luck mate.
Me: early 40's XW: nearly 50 T: 15 M: 5 BD: Jan 19 S:10 SS: 22 SD: 24