I am aware of migraine sufferers with similar problems in similar situations; and believe me, migraines can go on for more than five days. Sometimes you need I.V. meds or an injection to get them stopped. Also, OTCs and too much pain meds can cause rebound headache. Activity can make migraines worse, also. Also, MRI is better for soft tissue imaging. Nausea, vomiting, sensitivity to light and sounds are common to migraine as well. Cluster headaches do come and go but not necessarily with a timed regularity. I would see a good neurologist or headache pain center. Sorry to hear about your pain.
Have you researched Trigeminal Neuralgia?
Does the pain also radiate into your jaw?
If it is after awakening it might also be TMJ related.