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The symptoms you have described of severe headache since last 8 days that is not much relieved by pain killers can be due to migraine headache.It is a form of vascular headache and is by high stress periods,hormonal changes,irregular sleep,food habits,bad lifestyles etc..There can be various triggering agents.
Another possibility is of that it can be mixed tension migraine that is a headache with features of both tension(stress)and migraine headaches.Stress is an important causative factor of such headaches.Tension headache can be caused by tightened muscles in the back of the neck and scalp or in most cases the cause is unknown.
Other less probable causes can be neuralgia or temporal arteritis.
The CT scan usually comes out to be with normal report & this pain is not much relieved by pain killers.
Treatment includes NSAID's like (actaminophen,ibuprofen), Triptans such as sumatriptan (Imitrex), rizatriptan (Maxalt). The triptan with the longest history of use is sumatriptan (Imitrex).
Other medications that can be prescribed are:selective serotonin reuptake inhibitors (SSRIs), atypical antidepressants, tricyclic antidepressants (TCAs).
So I advise you to make an appointment with your doctor/psychiatrist for confirmation of diagnosis & hence these above described medications accordingly.This will help you greatly to provide relief from this severe headache.
Hope this helped
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