I HAN AN ULTRASOUND DONE ON MY NECK. NOW THE DOC WANTS A CT SCAN. SHOULD I BE WORRIED?

See below. Based on only the information provided it's impossible to give you specific guidance. Would need to know why the tests were done?, any symptoms? and the result of the ultrasound........But I understand your concern as it's only natural to worry about the possibility of discovering a serious condition in your body. If you would care to discuss further: http://www.healthtap.com/dr-lipkin.