Writing is definately easier when you don't get a migraine. In fact it's impossible to write when you do. Last night I had a migraine.
And to be honest I don't have any great tips for how to write when you feel dreadful. I've never got the hang of it myself.
The upshot of this is that I'm not much further on with my writing than I was on Tuesday evening, and this is a very short blog because my head's still foggy.