Viv,
I knwo exactly how you feel. My wonderful Persian cat, Solomon, was my constant companion, through some truly terrible times in my life, and when I finally had to make the decision to have him pts, it was one of the hardest things I have ever had to do. He was diabetic for the last two years of his life- my Mum too, was diabetic, so had already plenty of practise with insulin regimes, but my biggest fear was that he would hypo when out and would be dead before I could get to him. But couldnt keep him cooped up when he had always had the freedom of the farm.
But even now, I miss him, and he has been gone 7 years. I have a photo of him on my desk, stuffed into a shoebox, far too small for him- he always had a fascination for boxes!- and it is so typical of him. I often feel that he is still here when I look at that photo, so I would have a lovely one of Fluffy where you can often see it, and it will help the pain of parting.

Heather