Hi ,
I've had this pain in my forehead almost constantly for 2 years now. I've tried SO MANY things. Currently I am doing Botox as well as Gabapentin as my preventatives, and Ubrogepant as my acute med. This is the least pain I've had in 2 years. I believe that the pain in my forehead is often what triggers my "standard" migraine attacks.
I agree with what others are saying about finding a neurologist who is a headache specialist. That has helped me so much. My neurologist doesn't care as much about giving me exactly the "exact" diagnosis (my diagnosis is chronic migraine, which is true, but I think also my forehead is a nerve pain thing). She cares more about finding a treatment that works - and so many of the treatments help multiple diseases (for example, gabapentin helps migraine AND nerve pain, as well as other things like epilepsy). So that mindset has helped me a lot. Maybe I'll never know why I have this pain in my forehead, or what caused it to start, and I'm ok with that as long as I find a treatment that helps me be a healthy, functioning human. And right now, I am doing so much better!!
Also, a headache specialist will know all the frustrating details of what insurance will/won't pay for, which is really helpful!
The last thing I'll say is that when the nerve pain and migraines were most out of control, I had the most sinus type pain. And when my migraine attacks are most severe, it feels like there's an axe through my eye/forehead/temple. And finding a good "standard" migraine treatment calmed that all down for me so much, which was a great first step, but wasn't sufficient alone.
I hope you find a really good doctor who listens to you, and will help you try out many different treatments to find the one (or the combo of several) that helps you be the best, most functioning person you can be!