Diet plan to recover from anorexia?

I've been anorexic for a little over a year now. I've put on weight somehow by not being quite so consumed in it, but i still do not eat hardly. I'm 17, 5'10 and was 120.6 last time i weighed myself, which was a week or so ago (have probably gained since i haven't been on top of it as much) i want to recover. i'm terrified of weight gain, but i know i need to do this. i also disgustingly picked up the "chew and spit" habit which i do usually late at night when im alone and bored and confused about whether or not i should recover. my question- how can i recover without putting on too much weight all at once? i've tricked the people i'm closest to into thinking i'm just a health nut, so if i gain they'll say triggering comments about it, thinking they're just helping by telling me i'm gaining. so i can't gain it all at once, as it will probably lead to a relapse. what's a diet plan for me to get back to where i used to be? (156 at my highest..i wasn't fat at all but i would hate to be at that number again..maybe 140? or 130...if not lower) and also how do i stop chewing and spitting?!?! it is an addiction! and it's disgusting!! help please? and i can't go see a doctor. i can't tell my parents. they'll be pissed and watch my every move and plus i don't want to ask them to spend all that extra money on top of college just because i'm scared to eat. seems a bit selfish and stupid, and 'm sure they would have to agree. lol sorry for rambling. got lots to say i guess!