ok, I see.
I'd say you need more of your cals to come from protein, and probably more cals in general.
when I am dieting, i will usually base my caloric intake on a formula like this:
lean body weight x 10 = total cals per day
so, if your lean body weight is 160lbs, you'd be shooting for 1600 cals/day.
I'd say at this point, you are semi-starving yourself, which isn't beneficial to your metabolism