Hi Sue
I've had moments like that all the time. As I start explaining the problem to someone who isn't across the details it forces me be more concise and detailed. As I talk it through my sentence sometimes trails of to 'Col's an <<insert expletive>?'. The person stares at me whilst I'm thanking them as I realise the solution when I looked at it from a different point of view.
I guess it's up there with you never see your spelling or grammar mistakes until after you press submit or have someone with free eyes look at them. Your mind is to fixated that you are blinkered to your flaws.
Someone who posts on SCN like they are talking/rambling has not taken the time and effort to figure out what they are trying to get. Even if English is a second language, very basic improvements like paragraphs, headers (my problem, my confusion, what I am asking what I have searched and finally what I have tried), examples and screen shots can make a huge difference to asking a question. I don't think this topic is so much writing a grammatically incorrect sentence or spelling (though run spell check could improve that a bit) but more being structure and clear in your requirements.
Regards
Colleen