I kinda get this all the time because I read super a lot thanks to my nifty little eReader- Kobo Mini. And you can read all about it of its awesomeness right here.
Back to being book hangover, the only cure is to read more books. Yeap, and that's what I am going to do - to read more books! There are millions of great books out there waiting for me to explore them all, I can't waste any more time!
While I was browsing around the internet, I found this which practically explains all my book-hangover-feels. - 21 Signs You are suffering a book hangover.
Alright folks, I am off to reading more and more wonderful books.