I'm really pleased you've gone to them, torn.
I think the emotions you describe are perfectly normal. I expect you wake up every morning and hope that this was all just a bad dream. I also quite understand why you want to talk at some times and not others.
Be guided by what feels right for you, but I do think some distance from your H will help you, because like you so eloquently explained, you went from a great place to the pits of despair in a matter of seconds. You cannot therefore feel detached from him, because you love him deeply and can empathise with his own sorrow and pain. However, the truth is that this is going to stop you focusing on your own pain and what you need in the future.
Either through the counselling or a search online, have you thought about trying to find a support group for partners? Also, there have certainly been posters who have been in your position and I'm sad that they haven't joined your thread or that they might have left Mumsnet or name-changed, but it might be worth starting a new thread inviting those posters only to PM you, so that you can form an online support group.
It seems to me that you need an outlet for yourself and that in addition to the counselling, you are able to talk to people who have suffered the same kind of deception.
Thinking of you. Post only when you feel up to it. Put your needs first.