Hi Ducky, first off, can I just say that I'm so so sorry you're feeling like this, it's truly the worst feeling in the world and I can completely empathise with you, as I'm sure several others in this thread will be able to too. Big hugs.
To answer your main question, which is does the counselling help, for me I can only say yes, and that starting on anti-depressants was also extremely helpful (thank you @Threebutterflies for the suggestion, I am feeling much better on them). The counselling is like grief counselling for me, and it's really helpful for me to be able to talk about it and express my sadness because I can't talk to anyone else. I would advise you to start counselling asap, and to also speak to your GP about antidepressants because it sounds like you would also benefit from them. You are only 8 days out from the procedure, and are still reeling from the hormones too. With a bit of time you will start to feel more settled, I promise. I am still overwhelmed with guilt and fear and hate (towards my bf), but I am able to function during the day, and I don't have panic attacks as frequently anymore. Mine was ten weeks ago today.
I understand your rage towards your boyfriend, and to be honest from reading your post I am also full of rage towards him. It's so easy for men isn't it, to ruin our lives like this, without a care in the world. He's upset now because he sees how upset you are? What a fucking prick. If you need time away from him to begin healing take it. What I've noticed is that a few weeks after the procedure I cycled through intense feelings instead of just feeling grief and sadness all the time, mostly anger. Don't let him pressure you into spending time with him to ease his guilt, from now on you take care only of yourself, you are your priority now.
You aren't alone in your feelings, sadly there are a lot of women who are in/have been in your position, we're all connected through this experience of womanhood, and it's brutal. I'm glad you found this thread, please talk to us when you need. Sending you love xx