I use to get the empty feeling everytime but now I only get it after I finish a really good series. Sometimes it takes me a while to watch the last episode of a finished series because I don't wanna get that empty feeling afterwards. lol
YAY! Normality! I have a giant watchlist of anime so when I finish I series I will spend multiple days deciding the optimal one to watch next, during this time I usually watch anime that is for killing time like K-on and Nichijou.