Advice for CT. Ct mandatory pls advice!

Hi doctor, I am having head aches from many years.. I have used ayurveda and it decreased for few months. Then again i got head aches..again i used ayurveda and it didnt come for few mnths.. now from last few days..around a week.. i am having head ache in the back of head(left side) and behind left ear.I am feeling heaviness in back of head..sometimes i feel it when i bend down...i am also having pain in left eye.. i have got my eyesight checked and there is no power changed. I use laptop alot and mobile. As adviced in Practo i went to neurologist today and doctor adviced me EEG and CT along with blood tests.EEG and blood tests are completed but yet to get CT scan, reports were okay.RBC and HCT and HCT are high by one point.. PCT,MPV,PDW are declined by one point .. EEG is normal..Vitamin B12 range is 147 which is low. Is that because of vitamin deficiency doctor ? or else is it mandatory to get CT scan. Doctor said it might be bcause of migrane or sinusitis.is CT mandatory pls advice