Off to the doctor ASAP.
Have alook at this, may be helpful-not for me to say, but I'd be worried.

Symptoms of Brain Aneurysms
Ruptured Cerebral Aneurysm Symptoms

Sometimes patients describing "the worst headache in my life" are actually experiencing one of the symptoms of brain aneurysms related to having a rupture. Other ruptured cerebral aneurysm symptoms include:

* Nausea and vomiting
* Stiff neck or neck pain
* Blurred vision or double vision
* Pain above and behind the eye
* Dilated pupils
* Sensitivity to light
* Loss of sensation

Unruptured Cerebral Aneurysm Symptoms

Before an aneurysm ruptures, patients often experience no symptoms of brain aneurysms. In about 40 percent of cases, people with unruptured aneurysms will experience some or all of the following cerebral aneurysm symptoms:

* Peripheral vision deficits
* Thinking or processing problems
* Speech complications
* Perceptual problems
* Sudden changes in behavior
* Loss of balance and coordination
* Decreased concentration
* Short-term memory difficulty
* Fatigue

Because the symptoms of brain aneurysms can also be associated with other medical conditions, diagnostic neuroradiology is regularly used to identify both ruptured and unruptured brain aneurysms.

It is confusing dealing with headaches like this.

I'd get evaluated by an opthamologist to see if you have any pressures on the optic nerve. There is benign intracranial hypertension(also called pseudotumor cerebri) which affects vision. Also pituitary adenomas are pretty common and in many people don't give many symptoms.
But they can press on the optic nerve, or create pressure within the skull.

A good neurologist who deals with headache alot, may help. There are many forms of headache that people call "migraine" which are really not.

So I agree with Peter... please get some medical help.