I had two cats, and have had cats all my life, but Jack and Luke were very special.
Luke was with me all the time, and I'm sure nobody will ever understand how much this 'animal' loved me, and I loved him.
Unfortunately Luke (the brother of Jack) never came home one day (OK, I'm crying already into my keyboard) and I spent the next few weeks walking around streets and fields clanking plates together shouting "Lucas, din-dins", calling animal sanctuaries, vets, and the road cleaning dept of the council for any reports of a dead cat. My heart was broken, completely.
For anyone else this was harrowing enough, but for someone with anxiety like myself this triggered all kinds of things, including shaking, unimaginable depression, and thoughts tooo shocking for TV as to his end...including being lost wandering around some city because he might have jumped in a dleivery van from the city...which was worse than death for me. I never saw a body so my mind tortured me with possibilities for a long time.
I shivered, I wept, I blamed myself and lord knows what else.
I didn't eat either, I was distraught - and I'm a fella!
Even without anxiety or depression your reactions are normal, I'm a cat lover myself...I TOTALLY sympathise.