float_on
i understand your pain...for a while i was very similar. i too kept a mirror at my desk. also in public i would use the back of my ipod as a mirror to check my lips. i got into a bad almost-ocd like habit of touching my lips with my fingers to see if they felt messed up.
i'm also too familiar of picking at my lips with my teeth or fingers, even though i know i shouldn't, and then asking myself "why the eff did i do that???" afterwards and feeling pretty bad about it. i also noticed that i tend to this more when under stress.
my advice to you would be to use apply aloe a few times a day, so they feel smooth when you touch them, and just be really mentally tough about not touching or checking your lips. it is really hard but it can be done. i've gotten a lot better about it then i used to be. stay strong! - and remember that you're not alone, there are other people like me fighting the same fight.