I, too, have dealt with a headache for almost two years. It has eased over the past three months, but I still have a dull ache, oh, about 3-4 days a week.
I take Frova (an abortive migraine med), but only when I'm having a true migraine. The other HA...when it's around, nothing works.

One thing that HAS given me consistent relief is visiting a chiropractor. Last year I went to the ER with such terrible pain. They gave me IV pain killers...nothing worked. I went to a chiropractor that a good friend suggested, and after one adjustment I noticed relief. The trick with chiropractors--find one who is legit, and don't let them con you into visiting every day for 20 years! I did go 2x a week for about a month, then once a week, then down to every other week. Now, if I'm lucky I can find time to go once a month. But, when the HA is in full force, the visit is worth it!

Best wishes!