How to approach motivation for work during Vipassana?

My career involves lot of self-learning, and self-motivation. I like my work, which is a reason why my work doesn't feel like work. However, I am finding it hard to incorporate Vipassana into my work. For example, if I'm working and I'm in the *zone* there's a general pleasurable feeling associated with motivation/focus. It's what keeps me going. I feel like it's a mental state that's actually valuable specially in today's society full of procrastination. However, if I mentally note that sense of motivation/focus, it does fade away, but it makes it harder for me to concentrate and enjoy work. In fact, I even get slightly depressed and begin to hate the work. Then I would mentally note those negative feelings, but they will come back and I begin to feel miserable, and like a robot. Will this go away? Should I constantly "mental note" my feeling of motivation/focus, similar to how one "mental notes" a feeling of anger? How am I suppose to apply Vipassana in this situation?