I am feeling cold like sensation and a sensation what i cannot express in words,but i feel its not actually pain.i feel in right side of my head a cold sensation.when i lie down on bed this unknown cold sensation starts...although it is not permanent sonetimes it happens and goes away on its own and then again it repeats...is it can be due to cold??or something else?plz share your doubts..i am really very depressed because of this health issue..plz suggest me any medication for relief.