Whe I have to go out in the world, it is exhausting-especially if I have to go out for two or three days in a row. Then I allow myself a 'quiet' day-stay in my pjs, don't take on any responsibility-sleep or read or watch tv. I think tv is wondereful! It is something to take me out of my head, or even just keep me company when I'm reading or on the computer.
So quit beating yourself up. This is what is working for you right now and when you start to feel better, and you will, you will adjust your schedual accordingly.
You take care of your animals, which is great and should always be #1. But as far as just staying in bed with nothing to occupy your mind, that is something you may consider changing. Listening to those racing thoughts and feeling guilty and ashamed is not good. Maybe you could read or find something else (crafts?) to do and still stay in bed.
I understand the apathy, but you have to fight it. Do't let it control you. Maybe you could just take baby steps and find one thing each day that will make you smile. I have a cat (the most wonderful cat in the world, of course) and just playing with him and spending luvy time with him every day always makes me feel better. Maybe you could do that with your favorite dog or all of them?
But this is a great place to come and reaching out to others who suffer the same way can be a start to healing. Hope it gets better! Feel free to PM me if you want to talk.