rush kind of feeling when i'm hot or tired - anxiety?

you know that feeling you get when you almost hit something in your car - that rush or fear? 

well for awhile now when i'm super tired i get it but not as extreme and now when i get hot i get it.  i'm also tired though.  ha

does anyone know what i mean? it's like a hot chill.  kinda freaks me out.  but i'm prob. just tired.  

if i explained it to my doctor i'm sure he wouldn't know what i meant.  it's hard to explain. 

 

i had my hormones checked this summer by my ob and she said no. it's more when i get hot really. but who knows. things change. i also increased my thyroid medication a month ago.