Rachel I was 5'4 and went down to 79 lbs, i definet;ley had an eating disorder. Im closer to 5'3 now due to my discs in my spine squishing closer together. Now i am at the other end of the disorder, im at least 60 lbs overweight and struggling to lose it. I cant excersice except foe my pool, but u hat the sun, im in bed by 7 do to sheer fatigue.
So I know where coming from you dont want to gain weight on the anti ds, and there ones out there that not weight gaining. But you definatlley dont need to lose 15 ls=bs, that would put you consideribly underweight, you might want to see the eating disorder specialist, it may help.
Your husband and you your family are in my prayers