i have been suffering with severe occipital headachesx2 yr usually relieved with steroid shots into occipital nerve in my head/scalp and c spine i have had this ha x 4 weeks and havetaken lots otc meds and gabapentin , which makes me very tired i also have a hx migraine , treated with fiourinal 1 tab prn , roughly 1 per week. today while having a mammogram i developedsevere lighthead , generalized body pain and yawning a friend said possibly panic reaction , but i felt no fear and am a very calm person any ideas whAT IT COULD BE