Tree:

Wow, you are really getting it on all fronts. Certainly a stressful situation, and I wish you well. Other people can't make us feel anything; we control our feelings. If you W friend gets to you, that is something you are doing to yourself. Examine your reaction--what is it about her being nasty that bothers you? Why can't you let it roll off of you? Note: I am not intending to be mean sounding in my post. Rather, I see moments like these interactions as chances to step back and watch ourselves. If we do so, hopefully we will learn about ourselves.
It may take a while, but I do believe we can use these hard moments for our own good.

I wish you well at the L office. I haven't gotten that far yet, but I feel that would be a hard meeting indeed. It has a sense, I suspect, of creating a feeling of finality that we are at best uncomfortable about and at worst just don't want to believe is really happening--our M may be over. Keep us updated, and hang in there. You are doing fine.