I understand too...I used to have a bunch of hobbies and now i am just like "blech." Maybe even if you just go sit outside on a park bench in the sun that could help. I know that my kids want to go to the park even when I feel too depressed to go, last night I literally felt like I was dragging myself there, but I went. Felt a smidgen better getting outside.

Even if you just sit outside on your porch? One step at a time.