Motivating my Motivation

I've been trying to get myself to write for a very long time. After having developed this habit to write in fits and starts, I found having really written nothing worthwhile in the past year. The main problem, as I realised only recently, was that once I had written something with a lot of conviction and excitement, I thought the same thing to be very boring after a couple of days, then re-wrote it and the process continued, so I never got past the story stage on any of my own projects. Its been quite a frustrating experience and has amplified since I installed an application which gives me time in its minutest detail. Its so overwhelming to see time fly past that I've started working really really fast and get tired with equal speed. But the motivation level has sure gone up, a lot. I wonder if I can create an external motivation for me to remain motivated. For one, its very difficult for me to remain motivated for long periods of time, two, I have so many projects hanging on my head at any given point that half of this period of motivation is spent trying to prioritize projects. Once that is done, I only get up when I've finished all that I started off too do. But this principal for me, applies in manual labour jobs, graphic and web design and many other things I do, but not in story writing. 

So I continue to think of ways of motivating my motivation.