We ALL get that way, at times. We beat our heads around one problem and get tunnel vision, and cannot see the actual problem. That comprises two of the excellent attributes of this forum: first that we (sometimes, not always!) get to take a step back as we are describing our issues, and second that our colleagues can see the stumbling blocks that we are too close to notice.
I have also noticed a strange but persistent tendency for answers to stay hidden until I hit "submit" on a query, and then suddenly they jump out from under whatever they were hiding in!