emotions

what ARE emotions...?
what is the feeling of being happy, sad, in love, depressed, ...
what are they?
i do not know the answers because there is no emotion in me...
i cannot feel emotions anymore... why is this? whats happening to me?
i live everyday just living... but where are the emotions that embraced me so nights ago?
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that is what i felt like a few days ago...
but i found one emotion that is trying to force it self in... this was the emotion that i havent felt in years... the emotion of ______. why is my heart going "pit-pat"? why is this happening?
it shouldnt be doing it! it cant do it! but why is that the emotion came back so recently? this feeling that shouldnt be there is keeping me up in the nights and keeping alert during the day.... why... this strange feeling is taking me over like a drug... a drug to an ex-drug addict...
drug that i should not take... but why is it that im enjoying this drug... why...?