Hi, I read through your description of how you feel and then read all the posts so far including the one from Padraig. I found them all helpful but I called this timing because it's only struck me just recently how different my father looks. How lost and helpless he is soemtimes, so like the child and unlike you I haven't lost him yet,(though it worries me sometimes he may one day decide to stay in bed and then switch off whilst I am away) but for now he is still here and I'm lucky in that sometimes I see the old him. And this is where i am going, very slowly.
Now I mentioned Padraig simply because I think in his way that is a good way forward and I'm not knocking counselling, it maybe the best for you but I see value in his post as well and from that I draw strength and I say to you; When she was ill and not looking like the person you remembered can you recall a day when you suddenly saw her as she was, it may only have been a glimpse a flash, it made you happy, if only briefly - inside you find that picture, believe me it will exist and from that you will begin to heal. I'm storing mine up, silly things that you know she knew she would never have done when of her right mind, but they made you laugh and made her laugh. I think you may find you did the same, open that treasure chest with or without counselling help.
And talk to all these wonderful people here. i know I'm going too. Andy51058