Hi @aloy, waiting is truly agony! I recently started seeing someone to deal with the stress, and to identify healthy coping mechanisms I can rely on during grad school. She gave me some form of the sheet at this link to fill out when I start to panic - and it's actually really helped! It gives me a finite amount of time to identify and explore how I'm feeling before I move on. She has also encouraged me to write down (yes, write it down!) a list of at least ten things I can do when I'm stressed, and at least five people I can contact. Cooking is at the top of mine, because it includes all of the senses - leaving none for fixating on admissions results! I also run, and do yoga when I can.
Starting the research necessary for your doctoral project may reignite the dwindling motivation you mentioned. I poked through some archives this month, and in doing so I remembered why I love art history, why I have succeeded thus far, and generally made me feel more in control of my life. If you can't access primary materials, you could start putting together your lit review (organizing that spreadsheet/Zotero folder will also be a fun organizational game).
I hope that at least some of this is helpful! Best of luck