Hi Metagirl, i'm also 5'6 and i'm 168lbs.
I used to be about 147lbs and was happy there... I got ill and dropped down to 105lbs then swung back up to 182lbs!! i'm trying to get back down to somewhere near my original weight but my binging is hindering me!!
Enough about me, all i wanted to say is good on you for deciding never to binge/purge again. If you do slip up and it happens again, don't worry too much about it, we all have moments of weakness. The best thing to do is just start again from the next day. That's how my dieting works for me. (when i don't binge! lol)