I hear you man.

Pandora's star did the same for me, I can re-read it and I keep finding new details. Same goes for final fantasy 8. Some stories and concepts are so captivating that you can just spend hours hypothesizing the world outside of the books/game/movies.

A great short series I just watched is called "anamnesis", it's based on lucid dreaming with large elements of precognition and dream sharing. Whilst I'm not a believer in those concepts the series is exceptionally gripping and pretty much takes portraying a lot of lucid sensations to the next level. Definitely recommended just to fill the gap.

One thing I've also enjoyed in the past is writing your own fiction, be it original or connected to your favourite series. I had a lot of fun thinking up new ideas for a little side story for pandoras star and now I've started in a universe I conceived many years ago.