What can cause a metal smell in my nose everytime i breathe in and a foul smell when i clear my throat. It comes out of the blue and usually lasts rest of day. I get it once or twice a month or sometimes little more. I have been waking up with back of head and neck hurting bad which causes a migraine and then my eyes start to feel like there pulling out my head and it lasts about all day and been happening 3 to 4 days out of a week lately and i seem to be very forgetfull this past year. Also have alot of pressure inbetween my eyes alot .