Blogging woes.

A friend of mine has a blog. He recently wrote a post on his blog. I read it and told him so this evening. "Yes, That one....ya....wrote it last evening. Although it didnt turn out quite the way I wanted it to."
Ya. It does happen..... lots of times doesnt it?

You want to write something......but you cant think of a topic.
You dont want to write something but you are feeling trapped and lonely and want to release some frustration and express it in some form of the other and feel that your blog is the best way to vent it out.
You had a fixed topic in mind to write about, but when you started writing....you drifted away from the issue....
You didnt have a fixed topic but whatever you wrote came out well.
You remember some incident, feel like writing about it.......but somehow after writing it down...it doesnt seem to be like the same incident !!!
You start writing about a serious topic and when it is written down....it sounds rubbish !!
Sometimes you are just tired and cant write..although you want to...

Lots of other factors that way or the other. I henceforth cristen them as the 'Blogging woes'.
Wonder how professional writers handle these kind of woeful mood swings?