I'm surprised I'm finding myself feeling very angry at my W. <SNIP> Why has this reared up all of a sudden?
Because you've started posting on other people's threads. What is happening is: You're recalling her actions and recounting them as you share. This makes you angry. Also, you're angry with yourself for not having listened and followed some of the advice you got. And that's OK... just stop beating yourself up about it.
You're giving good advice to others BTW and I hope you stick around.