I just said goodbye to faithful companion

She hadn't been well for few days, in fact really, I was back and forth to the vet for the last few months. Anyway, my Whizz developed heart failure which worsened over the last couple of days and she stopped eating or drinking so I couldn't get any diuretics into her. We had a lovely afternoon together and she knew something was up as she followed me around the house and sadly I took to the vet for the last time. I then brought her home and buried her in the garden, near to Bonzi's grave.

So I have said goodbye to my little companion and feel like shit. How can doing the right thing feel so awful?