I too practise positive thinking, now I'm practising acceptance as well. Hard to do when I really want a postponement of the inevitable.
There's a saying "Grant me the wisdom(?) to accept the things I cannot change, courage to change the things I can, and the wisdom to know the difference" that sums up my current outlook.
Just knowing others find it tough going is somehow comforting to me. I'm usually the strong one, hard to accept I am as vulnerable as I feel at times.
I am starting to realise how important it is to care for myself and I've just spoken to Carers Victoria about getting counselling because now it's more about facing the facts. I still head into denial even as I say that.
Anyway, I hope you are doing ok Doreen.