cluster headaches
"Sumatriptan is a life changer. I've suffered from cluster headaches for 24 years having one at least once a week and NOTHING has ever come close to helping. Now I haven't had one in 3 months. I take a pill when I feel a cluster headache coming which successfully aborts it. Even hours into a full blown attack I took a pill and relieved 95% of the pain. 



Another great thing? My insurance covers it 100%. Even better: it is only $16 for 9 pills (you can break them in half and have 18) without insurance."