Todd,
It's perfectly "normal" for nothing to show on a CT scan or MRI when someone has Migraines. Migraine is a neurological disease casued by genetics and overly sensitive neurons in the brain. These things do no show up on imaging studies.
Migraines can begin at any age, and there's not always a particular reason for them starting when they do. Is there any history of Migraines, "sick headaches," or "sinus headaches" in your family?
With a diagnosis of Migraine disease, you need to identify what's triggering your Migraine attack(s). It could be back and neck issues or any number of other things such as poor quality sleep, changes in the weather, or certain foods. Here are two articles with downloadable workbooks that can help you identify triggers -- Your Headache and Migraine Diary and Managing Migraine - Migraine Food Triggers.
Have you had one solid Migraine since July, or is it a string of Migraines. When the pain of a Migraine lasts longer than 72 hours without at least a solid four-hour pain-free period, while awake, it's termed status Migrainous, and needs serious attention. Here are a couple more articles for you: Status Migrainous - The Basics and IV Treatment of Intractable Migraine.
If you and your neurologist aren't making progress with treating this Migraine, it may well be time to consult an actual Migraine specialist. Take a look at the article Migraine and Headache Specialists - What's So Special? If you need help finding a Migraine specialist, check our listing of Patient Recommended Migraine and Headache Specialists.
I know you're going through a rough time. If you'd like some additional support, come join our discussion forum. You'll need to register again once there because it's a separate membership database, but you can use the same member name, email address, and password that you used here. You can find our forum at http://forums.healthcentral.com/discussion/migraine/forums.
Good luck,
Teri