Been there; got the scars. :-}
Dancing requirements are one reason why I try to follow the MVC (model, view, controller) philosophy, as well as (more recently) designing for orthogonality. If you work on little pieces, they can be reassembled as needed; you also stay focused on what's important...getting the job done and staying flexible enough to stay employed.
Allow me to suggest The Pragmatic Programmer as something to take your mind away from the real-world aggravations, as well as providing some solid ideas for living effectively in an agravating development world. Indeed, it can help make that world less troublesome.
--f
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