I can’t lose weight

I’m 16 when I was 14 I got the nextplanon implant and I have gained 30+ pounds since then. My eating habits have been the same I don’t eat many meals but I have tendencies to snack especially around my period. I am recovering from an ed that I had when I was 12 and it’s hard not to fall into those old habits so I make myself eat. I lift weights and I tried cardio in the past and nothing works. It’s a constant battle but I know starving myself won’t fix anything either. Please help!!!