Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I can not tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information (i.e., a differential).
There are several causes of headaches. Headaches can be divided into primary and secondary. Primary headache disorders are headaches without a direct cause. These are diagnosed after secondary causes have been excluded. Secondary headache disorders are due to an underlying problem, there are many many causes but some include medication side effects, systemic illness, nervous system infection, tumors, bleeds in the brain or clots in the veins of the brain, and others. One such cause that may be relevant to you is meningitis. Did you have a lumbar puncture performed to evaluate for meningitis (viral)?
Overall, primary headache disorders are much more common than secondary ones. There are several primary headache disorders, over 50 different types. For example, migraines is a type of primary headache with pulsating throbbing one-sided pain, nausea, and discomfort in bright lights that lasts several hours.
Another type is called tension type headache which feels like a band around the head but does not affect your daily activities. With these headaches, there can be sensitivity to light and or sound and sometimes nausea. Neck stiffness can occur too. Medications and/or physical therapy may be best for these headaches (in addition to decreasing stress).
Without further information about your headache, it is difficult to provide you with adequate information. However, it is important for you to understand that if you have not experienced headaches in the past and you are now having new head pains, seeing a neurologist is a good idea, just to make sure there is nothing serious causing this pain.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.
I have hydrocephalus and I have all of those same symptoms, maybe you should have your csf pressure checked.
Also, if I had a CT scan already, should I get a MRI too?
Thanks!