I don't think I have exactly the problem you describe, but I definitely go through phases. There are times when the only thing I can think about is playing the piano or pieces that I want to learn and making lists of things I will work on in order and so forth. There are also times when I think of everything but piano, like work, working out, other hobbies, video games, nothing, etc. However, I always try to play a little even when I am in a slump or have no specific 'goal' in mind. So, I can go a month where I practice ample each day for a month to go straight into the following month and barely practice an hour a week.
However, as of the couple of years or so, I have found myself exploring composers I haven't listened to as much as others. For example, growing up, I always heard my dad play albums of Beethoven, Chopin, and Bach (mainly). There was some Rachmaninoff and Schubert thrown in from time to time, but those were the big staples. So I had a very fond relationship with famous or great works by these composers, like the Moonlight sonata and the Waldstein sonata and the Chopin Ballades. But, even as a kid, I started to explore Liszt and others (although, at this point in time, it was mostly those albums that were just a weird collection by random players), but I didn't really find those best works by these composers. It wasn't until later in life that I started to go down these rabbit holes with other composers, like listening to the complete Harmonies or Annees of Liszt or the complete works of Prokofiev that I started to find new things I latched onto. Those pieces that I listened to on repeat ended up inspiring me to learn some of them.
So, now that I'm older and have learned most of the pieces I want to by Beethoven, Bach, and Chopin, I'm finding myself getting excited by other composers like Godowsky, Szymanowski, Janacek, Prokofiev, Scriabin, Franck, and Faure (and the less played works of Liszt). That personally keeps me interested, but I guess each of us has a different response to these type of things. This also grow my list of pieces that I absolutely must learn eventually.
I agree, breaks are also good. It can certainly free your mind and allow you to come back with more vigor than before.
Don't know if this helps. Just an interesting problem to have. I am both sad for your current situation and jealous.
-KC