Ahhh, I'm exactly the same like that with my hair and positioning thing
On days I've been in hysterics, locked myself in the bathroom in floods of tears and refused to go to school because my fringe won't sit right.
I've also been hours late for school because I suspected my hair was that little bit greasy and had to wash it.
And if I can't sit in a certain position (facing the person front-on, my head down slightly and on a bit of an angle, and my hand fisted under my chin so I don't look like I have a turkey neck) then I just won't sit at all, I'll leave the room so to avoid being made a fool of.
I also used to take scissors and cut out freckles and blemishes to make myself look more symertrical, although now I'm just left with scars.
Sometimes, as much as I'm ashamed to admit it, I'll start self harming because of how much I despise myself, and I do, I hate myself. My family and friends always pick on and make fun of me because of how 'obsessed' I am with my appearance, and it just makes me feel even worse because I feel so alone and ugly.
However I'll force myself to the extremes to make sure that I act and come across as confident yet modest, coz I know guys like that
Hopefully though this'll end when I leave home, and I can get plastic surgery on my throat... I hear that they cut strips off your chin and tighten it around your neck so that it defines your jawline more. Which is what I really want... My saggy jawline is what's stopping me from looking pretty and I hate it. I've tried everything, exercised, starving myself to try and lose weight, drinking tons and tons and tons of water, using a belt to strap it up in the night to try and reduce it (just ended up in my not being able to breathe though). But nothing works !
I don't think it's an actual mental problem though, it's probably just me being cautious because I AM actually ugly, and I hate when anyone dares try to tell me otherwise because I know, they don't, end of.