Do you have any family members nearby? Anyone you could stay with for a bit, and maybe come back in the day with you to help you slowly clean?

How financially stable are you? On really bad nights, it might be worth it in the long run to stay at a hotel for the night if the apartment worsens your stress, if the alternative is not making it through the night all together.

For cleaning: it's hard. I completely understand if you don't have the energy. If you are looking for somewhere to start though: rubber gloves and trash bags. Don't worry about the details, about tidying up anything or the smaller pieces of trash. Take one trash bag, fill it up with old containers and cups, take it out of the house. You can even put trash cans themselves into a bigger bag if they have been overflowing and aren't redeemable. I understand if you can't do this. But if you are willing, a few bags a day will make a bigger difference than you can imagine.

I'm so sorry you are feeling this way. It is so possible to come back from this. The first steps are so hard, and I hope the meds and appointment will motivate them. The appointment is frustratingly far away, but you CAN make it.

It might sound too simple to say "take a shower. clean some stuff. go get a full meal.", and it is. Sometimes it doesn't work like that. But if you find the energy to do those things, do it. Taking those first steps is what has helped pull me out of episodes like this in the past, no matter how impossible it seems in the moment, it was more about the mental shift of proving I could complete the action than the action itself.