Insecure Writers' Support Group! Good news (other than me remembering in the nick of time) is that I've found the cure to writerly insecurity. Simply be so busy you don't have time to fret!
Of course I'm lucky in that madly busy for me still allows for writing time. For those whose busyness means little or no writing time, then I can see it might make things worse.
Darn - not the perfect cure after all.