Breast feeding moms please help!!!

So I exclusively breast feed my son and it's making it IMPOSSIBLE for me to gain weight. Before pregnancy I was 105 and I'm 5 foot. It was a healthy weight for me and I liked how I look. Now I'm 6 months pp and I'm 92 pounds and doing everything in my power to gain weight. I eat 24/7! My doctor said by the next time she sees me she wants me to at least have gained 5 pounds I have no idea how to do that. Is anyone else having this problem? I look like a 10 year old girl at this point. My size 0 jeans are even too big 😩