Writer's Block

I don't know if what I have right now is full fledged writer's block or if I simply am not getting much time to sit down and right and that is making me press more than I should when I do have time.  Case in point is today.  I had a bit of time to get some writing done today, but unfortunately I only produced about 400 words.  I have had a few fun ideas for stories, but I just need the time to sit down and write them.  I have been overjoyed by the sales I'm getting, but I would love to get some more feedback here.