Wanda (Sykesville, Md) on 03/10/2009:

Whenever I get auras, sparkles and blurred vision and feel a migraine headache coming on, I grab a lunchbag (McDonald's bag works fine), and breathe in and out of it for 20 minutes. The carbon dioxide that I breathe back in helps constrict the expanded blood vessels which create the pounding headache in a migraine. I've used this technique for several years, with great success.