DonorConceivedMe, I too read 'The Primal Wound' and it was extremely helpful.
1984isHappeningNow, I laughed at you having 'councilling'. Cheered me up no end :-).
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Onlythedoglikesme, I hope you are feeling a bit better now. I'd like to think we on here can help you. How you are feeling is understandable but you'll adapt and you don't have to immediately embrace your sister. Just give it time. Nothing & no-one can replace the relationship you have with your mum.

My birth mother died a year ago (adoptive parents many years ago), I only ever met her once, in 1987. She had told no-one at all about me, including her husband, and when I met her she was widowed. She had no more children but I have cousins; in her will she left everything to be split equally between me and them! Six of us. She wanted to do the 'right thing' and I am so grateful for that, am no money grabber but was extremely touched to be left anything at all & it will be a tidy sum - if I ever get it :-).
I was supposed to be given my inheritance in October last year but one of the beneficiaries has raised a query so I am waiting......... No idea at all what the query could be but it is a bit hurtful. Probably because I don't know what it is all about, are they objecting to me? One imagines all sorts of things.
My cousins don't know me though one, who was an executor, telephoned me after she died & she sounded really nice. Two of them live in other countries. I know they are all well educated and come from quite well off backgrounds, younger than me of course. My mother was the eldest of three sisters, one had four children and the other had one.
There is still one sister (my aunt), living. I know about her, she has one child and is widowed, her husband had a good business.
I've had communication from a couple of good friends of my mother's who were gobsmacked to know she had had a child, one couldn't believe that she had kept the secret so long and not told her. They have been lovely, I've not met them as they live so far away but we've written, e-mailed and one even sent me photographs of my cousins at the funeral.
These are complicated issues. No-one really understands unless it hits them personally. I can understand how you feel, also how your mother and half sister feel. It's difficult.
I certainly didn't want to turn this thread into being about me & will not be offended if you ignore me, but wanted you to know I understand from various angles and could only do that by telling you a bit of my history. I'm a lot older than you. I've definitely been affected by my mother dying and the will, it certainly hasn't helped my mental health but I'm trying hard not to dwell on it too much.
I feel as though I want to give you a virtual hug. I expect it seems odd that you aren't happy to find out you have a sister but your siblings are. Well, we are all different!
I hope this passes quickly for you
. x