So sorry, Prettybird (your name is nice too!) My mum had a fairly major stroke 2 years before she died so like you I did have to get used to the fact that my mum had "changed". I did grow to love the new person she had become (mostly very docile and sweet, and pathetically grateful for our care of her, though there were the odd distressing periods when she became anxious and paranoid )
I seemed to accept her death better for the first year than I do now - I'm always thinking about her nowadays - wishing she could see what we're up to these days - wondering if she ever knew how much I loved her and how grateful I was for all she did for me and my girls - I wish I had told her that more often - but I think she knew.
Your life changes forever after you lose your mum, doesn't it. There's no longer anyone you can turn to who is unequivocally, unconditionally on your side the way your mother was, even if you didn't se eye to eye on everything, all the time.
I'm grateful however that I had that close and loving relationship with her - I guess that some of the people who post of major relationships with their mums never even had that - so I try to feel lucky. But I just feel she had more life to enjoy and left me too soon.
And HappyMummy - my heart goes out to you losing yours so young - that puts my whinges into perspective. Just remember that a part of her lives on in your DS and in all the generations to come - a thought that gives me comfort at times - a very real continuity.