Welcome to HCM.
Based on the symptoms you have been experiencing you are suffering from Benign positional Vertigo
Vertigo is caused by labrynthine dysfunction, neck injury
, cervical spondylosis
, head injury
or rarely tumors.
As the CT and MRI is normal you need not worry. The cause in your case could be stress.
Using labrynthine sedatives like cinnarzine or Beta histine will help you by relieving vertigo . Along with that using Anxiolytics like Alprazolam will help you combat stress and resultant head ache.
Few labrynthine exercises called Epley's manouvere will also help.
Whenever you have a headache, take a cup of strong coffee.
Please consult your doctor and discuss about the above mentioned treatment options.
Wish you a speedy recovery.