I don't think I have suggestions, ScarletPimpernel, as I am very much in the same situation. I just wanted to say you are not alone.

I still enjoy reading books (I've always been a big bookworm), but not as much as before, although I do read a lot. I enjoy going for walks, but only if I'm with my boyfriend. I enjoy listening to music, but not always, sometimes I'm just too tired even to open Spotify or to turn on my iPod.

I used to travel, go to the theater, go to the cinema, take long walks in the woods, do Pilates and other sports, hang out with friends, read, write... not much of that anymore. I just feel so empty and bored.