I have had blood tests come back normal, but I know there is something wrong. I'm awake, but don't feel like I'm awake. I have been experiencing such a weird "brain fog" & I don't know now else to describe it. I have a feeling I could be experiencing perimenopause. My dr put me on a birth control pill that I took for almost two weeks & had to stop taking it bc it affected my legs & I was worried about blood clots. She wants to do CAT scan next bc I've been worried about a brain tumor; she assured me I don't have a brain tumor, but will order it to ease my fears. This is the weirdest feeling & I cannot shake it...I am really worried that I'll suddenly forget how to get home from work or foul up badly at work & lose my job. I feel disoriented & just plain weird in the head. I suspected that it was my thryoid, but blood tests have also ruled this out. My B12 levels, hormone, progesterone, etc. came back normal, as well. My ears also ring constantly, which is very irritating at night when I'm trying to get to sleep. This has been going on for about three months & I really would like to get rid of this brain fog...please help.