I've got this too. It's awful, isn't it? Mine is more over the crown of my head, sometimes radiating into my forehead or temples. It's there pretty much non-stop. I feel okay in the morning, when I first wake up, but after about an hour it's there and stays, in varying degrees of intensity, basically until I fall asleep at night. I do have random, sporadic "good days" - this past Tuesday was one, where I felt great, closer to normal than I have in weeks. But those good days are few and far between anymore.
I can't see my doctor until September 3, but of course my mind is screaming "Brain tumor! Brain tumor!" despite the fact that the symptoms come and go and I have no other issues (aside from perceived weakness in my limbs, and my vision feels "off" though I can't specifically say what's wrong with it) and that everyone here with brain tumor experience has told me that all of my symptoms can be explained by anxiety. Personally a tiny part of me thinks it might be a result my bad posture. At my day job I spend 8.5 hours a day in front of a computer, more than an hour in the car commuting back and forth, and I'm also a novelist in my off time so I sit at a computer a lot at home too. It does feel better for a few minutes after I stretch my neck muscles. But that small part that wants to be rational is always drowned out by the much bigger part that wants me to have a tumor.
How's your posture? Do you have sinus issues or allergies? And I've read that physical symptoms can last for weeks, even months, post-anxiety...it takes that long for your body to go to a less reactive state. It stinks. I wholeheartedly sympathize with you!