I am sorry you are going through this. I am there too. Everyone tells me how "skinny" I am and I see it is a compliment, but at the same time, I know it is a concern. My doc has been urging me to see a nutritionist and finally i made my first apt. I have been seeing her weekly for 2 months now and we have made progress. She is teaching me combinations of food that work well together that keep my weight steady and give me more nutrition and energy. It is hard to stick to bc I think i am gaining wait everytime i eat , but the scale says i havent. it is an everyday battle, of course, but it has been helpful so far. I would recommend seeing one if u can - couldn't hurt!
My thoughts are with you!