What could be the possible reason for this?

I have a headache that hasn't gone away for a few years, and it's gotten worse lately. The pain also occurs behind my eye. I'm having trouble standing, no painkillers are working. In addition, I feel like flies are flying in front of my eyes, my ears are ringing, there is a buzzing in my head, as if a plane is flying. I don't expect you to make a diagnosis from here, but what could be the possible reasons?