Your mind will eventually be back at peak performance, but meanwhile you can use pen & paper to help you with this.
Write down what are the big challenges/problems, try to break them down and write about it, keep dividing it until you start to see that you can tackle the indidual pieces.
I'm 42 and I've been in a mental place similar to yours, but a little more drastic due to a hard time in my life, and it took a while to get back into top shape, but the effort to break down my problems on paper helped me tackle some immediate tasks I had to accomplish.
Write down what are the big challenges/problems, try to break them down and write about it, keep dividing it until you start to see that you can tackle the indidual pieces.
I'm 42 and I've been in a mental place similar to yours, but a little more drastic due to a hard time in my life, and it took a while to get back into top shape, but the effort to break down my problems on paper helped me tackle some immediate tasks I had to accomplish.