A writing schedule for a short story writer?

I am still trying to sort out what the Writing Life is, and several changes have provided food for thought. First, inspired by a blog post on Sarah's Writing Journal, I now having a writing buddy, Clare, who blogs at Three Beautiful Things. We were "fixed up" by Sarah, - thanks Sarah - and the idea is that every week we send each other our writing-related goals for that week, and then we follow up with each other to see how the other did.

So: we're into our second week, and the first week was great. My first goal was to set myself a writing schedule, so I created up a new Google Calendar for my writing, and laid out a daily, two-hour block of time for writing. Writing time isn't just for writing, it's for writing-related activities - submitting stories, following up on submissions etc..

And it worked well - if I was out I felt like I had a meeting to get to I couldn't be late for, with myself. What was also good about this was that I got rid of the guilt feelings of not writing, and there was a division between writing-time and non-writing time. This felt good, it felt like I was making writing more like a job. Yes, I thought. This is how it's supposed to be.

Now it's Week Two and questions are starting to arise. I sat down today for my two-hour writing time and I felt like I didn't want to be there. I felt antsy, irritated. I didn't want to write. I didn't want to edit anything, to revise. I didn't want to submit any stories. Suddenly this felt like a place I had to be instead of a place I wanted to be. I lasted an hour and a half, much of it playing Scrabulous and sending Short Review-related emails. Then I gave up and went and made cupcakes.

So, here's my question. If you are writing a novel, you have what to work on day in and day out. You have a need for quantity, you have to put in the time. And probably you have to do this every day to keep up momentum, although I don't know, never having written a novel. But - and it's a big but - what if you're a short story writer? Do you have what to do day in and day out? As opposed to with a novel, a short story can be any length, and more importantly, a short story writer needs more than one idea. A short story writer needs to "come up with" lots of ideas for stories. Not all at once, but every now and again. And the way I have been operating uptil now was that ideas would bounce around my brain a lot, first lines would appear just as I was falling asleep at night, and I didn't write them down but I played with them in my head. My head was the place a lot of the writing happened. If the idea vanished after a day, I'd let it go. Only the characters, the openings that were persistent, that knocked and knocked, get to the next stage of making it to the computer screen.

I like this method. And, more crucially, this isn't something I can force. If I force it, it comes out clunky. It's me trying to write a story instead of me writing a story. You see the dilemma.

How do I reconcile my desire for a routine, for structure, with respect for this whimsical, could-strike-at-any-time creative process, what is often called being in the Zone?

Of course, the real hard work, the revising and working on the first draft of a story, does require setting time aside for. This is the hard graft, this is nothing really to do with the Zone, this is me with my analytical hat on, my editor hat. This is the vital other half of the writing process.

Any other short story writers out there with suggestions? I don't want to abandon this new-found routine, but I don't want to get myself so irritated that I am not writing. Help!