Yeah mine usually lasts 20 minutes which is why I got really anxious. I was advised to seek urgent treatment so I did go, but by the time I was seen (3 hours later - fair enough) it had more or less stopped and I just had a slight headache and felt washed out. They didn't really examine me, except to hold a finger up and ask me how many there were and to take my blood pressure and temperature.They said my blood pressure was sky high (because I was anxious, Id guess) and theyd take it again before I left, which they didn't. They said it was just one of those things. They said if I got a bad headache or numbness it could be a mini stroke or some blocked artery in the side of my head? and to go back. I'm feeling better just don't like unexplained things and this was definately out of the ordinary and frightened me. All I really wanted was to talk to a clinican for reassurance but this was not an option.