I'm So Sad

I lost one of my cats yesterday. She was hit by a car and died soon afterwards from massive internal injuries. It was the loveliest day of the year so far and minutes earlier she had been rolling around in a patch of sunshine on my kitchen floor. I feel so sad that she's no longer under my feet, scratching my stair carpet, in the corner of my eye. She was so gentle and lovely and I feel so sad that she suffered and I could do nothing to help. Waves of grief come over me and I keep crying.