I have experienced for 3 strait years an agonizing tense feeling in my forehead and eyes (like it's hard to raise my eyebrows) along with dull headache 24-7.  It feels like the inside of my head is "asleep" like if you hand falls asleep.  Also feels like I have a constantly blocked nose.  

Another symptom that comes and goes is severe vertigo in any horizontal position even if I lay perfectly still for hours on end... and eye movements (not head movements) accelerate the dizziness... and blurred mental perception of visual details, the finer and more complex details of objects even when not dizzy (brain fog, as they say).

With no answers from various doctors, I have recently noticed that if my head is put in traction the tension feeling in my forehead is immediately relieved of tension but I still have a bit of a more throbbing-quality headache.  I have never been put in a medical traction device but I discovered this by accident and had someone pull my head up and hold it for 30 seconds and I felt so much better than I have in a long time but when they let go the symptoms immediately returned. (elavil and topamax useless).

I had a normal CT (w+w/o) and MRI (w+w/o), MRA (w/o), and MRV (w/o) of head plus MRI of cervical spine (w/o contrast).  Also had Videonystagmogram and EEG.

One doctor (a skull base surgeon/dizziness doc) looked at my MRI with me on the computer once, I observed him looking closely at the cerebellum cross sections and it was remarked that the brain is at the level of the foramen magnum but no herniation is noted.

My travel history in the last 5 yrs include Mexico, Honduras, Costa Rica, Jamaica, Bahamas, Western europe and Turkey.  The only frequent chemical exposure I am aware of has been leaded fuel, both fumes and accidental skin contact,  however it was not recent to the onset. I have also in the past lived in a 10 story building built in 1905.