I need some serious birth control help!?

I just had my daughter 6 months ago. I am looking for a birthcontrol that will not make me gain weight and last for a few years. I can't get the iud, ( i got pregnant with my daughter on it). i am thinking about the Implanon but i heard it makes you gain weight and when they take it out, your hormones go crazy? i need some advice on the Implanon or something else. thanks! :)