switching to a different birth control method because of weight gain

so i went to the gynecologist the other day, i currently have the nexplanon and it’s gonna be my second year with it - however, i’ve gained almost 30 pounds since i got it. i told the doctor i was concerned about my weight cause this is the highest weight i’ve ever been at….. and he told me to do intermittent fasting. basically to diet and exercise. i asked him what other bc method he’d recommend and he said the iud, but i’m scared of the insertion cause i’ve heard horror stories. i know i have to ask a professional about this but i wanted to know what birth control method would you guys recommend that hasn’t made y’all gain a crazy amount of weight. i know every body is different but i’m truly considering switching cause my self esteem is almost nonexistent since i gained weight. thank you <3