I had a similar situation. What helped was a combination of things.

The first thing that helped was vision therapy.

I got on a headache preventive medication. The first one I tried was elavil (amitriptyline), and then I switched to topamax (topiramate), which I still take.

I had therapy to strengthen and align my neck.

I stopped taking painkiller medications including tylenol, hydrocodone, and imitrex, all of which can cause rebound headaches.

Finally, I switched to a whole foods vegan diet high in omega-3s and tryptophan. This reduced inflammation throughout my body. I also helped kick-start the reduced inflammation with hydrotherapy and algal DHA/EPA. At this point, my headaches finally disappeared for good. I still eat vegan but no longer do hydrotherapy or the algal supplements.

I have been headache free for eight months now, after nearly 18 months with serious migraine-like headaches.