If the head CT was negative earlier this year, it is unlikely that something like a brain mass could have grown that fast. Other possibilities would include temporal arteritis, a bleed, as well as various types of migraines.
I would consider repeating a non-contrast head CT, and obtain a sedimentation rate (which would evaluate for temporal arteritis). If these tests are negative, a neurology referral can be considered to further treat and evaluate possible migraine syndromes.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b