I accidentally got addicted to eletriptan last Summer. It's been the only drug that has consistently helped against my migraines, but a side effect of the drug, ironically, can be more headaches/migraines. Once I realized what was going on, I stopped cold turkey, and I had a rough few weeks. Now I only take it when absolutely necessary, like once a month, and things have been much better.
Good luck with managing your headaches. Tracking information like this is super useful. I'd encourage anyone suffering from headaches too try it.