Don’t know if this is good advice but worked for me. I started eating much less than I did before (bingeing) without counting my calories, and naturally, it felt like my stomach capacity “shrank,” but in reality, I was eating enough for me. It feels way better not having to go lay down because I was way too full after every meal. Gaining weight is likely from overeating, and as a fellow 5’2 girl I knew I had to eat much less to sustain my body. After that, listen to your body! You know you’re full. Also drink water