I've been where you are. It's so hard...

Make sure you brush/floss your teeth and go to the dentist, though. Very important!!

Major depression can affect the most basic of self-care, but not brushing your teeth can lead to periodontal/gum disease that is a progressive condition and you can lose teeth.

For the rest, do you have a friend(s) who can come over and help you clean, etc?

Also, I find opening the blinds, putting on the lights and blasting rock music helps my mood so I can do some of these types of tasks.

Hang-in there.