My father had a seeming TIA and I took him to emergency room. (bizarrely unresponsive and out of it for about 3 minutes in public). They gave him an MRI, found nothing wrong. Part of me felt silly, but part of me knows I wouldn't have forgiven myself if there was something to it (he had a stroke years before which he partially recovered from). I'm glad to read this article now.
You did the right thing -- better safe, than sorry.
Many times doctors work on statistics, the say 95% of the time the symptoms "mean nothing", but if you happened to be in that other 5%, it's your tough luck.
When the potential consequences could be serious, it's the right thing to do to insist that they rule out the worst possibility, before assuming "it's nothing", rather than the other way around.