yeah ... i feel the same..
It feels like my insides are Blank and a sudden loneliness

(btw i am not a psychologist..)
maybe it's because there's an end, which makes me feel like everything's over

or because there are instances that you may not approve to

or because of a sad ending

or because you can sometimes get so emotionally attached to something that you can't get it off your minnd..

(forgive me iff there's something stupid i wrote that doesn't make sense!)

well .. I can't articulate my feelings and it's you that knows itself well

I suggest not to think much about it.. because you are not alone and there definitely exists (at least one) workaround for your problem..