Can writing be that draining, really?

I've been beavering away at two different stories that are funny at times and quite poignant others, and I am doing an extensive scriptural study along with exhaustive notes and am feeling quite drained.

Both stories were meant to be dramas with postively comical moments in them and now I find it quite difficult to keep them that way, at times breaking out in tears, and thunder for no real reason. My God, I thought my drama days were long over!

Come on, can writing really be that draining or am a simply a selfish wimp?

Much peace

Gwendolyn