Una, sweetie, I am sending you big hugs. I have been in a bit of panic mode myself, but for different reasons, and it's no fun.
I don't know if you're anything like me in this regard, but I'll tell you what I experience in case it might be helpful to you. I get so busy doing and running and going that I stop feeling anything. Then when I stop for a moment, all of the emotions that accompany such a time of transition flood me and I lose it. I have had two of those episodes lately. So, if you can take just a brief time to sit quietly and process the change you're planning for, and let the emotions come, I think it can help. I swear, yesterday morning after a good cry and a shower, I felt much better.
Try to get enough sleep. I know, I know, it's so hard, but it helps. Last night I finally got almost 8 hours, and I'm so relieved.
Prioritize. What absolutely has to be done today? Put everything else in the back of your mind. If you catch yourself scrambling to do something that doesn't need to be done now, stop and refocus.
Accept help. In fact, ask for it. I'm really, really bad at this, so remind me to follow my own advice. People who love you really do want to help.
I'll be thinking of you!