Migraine
"I have had migraines for almost 40 years. I have the type where I lose my central vision and have a halo effect for appx 45 minutes, then horrible pain sets in, and throw up for several hours. This will last for appx 8 hours, then the pain eases off and lingers for almost two days. I usually ended up at the hospital where I have had Demerol, Imitrex, etc, which did not work.  One day I lost my vision, and tried Excedrin Migraine. This stopped the migraine cold. Never before had any medication even slightly reduced my pain and nausea. This was 14 years ago. I take two as soon as I start to lose my vision, wait until the halo effect subsides, then I can go about my day. Excedrin Migraine returned my life to me."