I haven't had the implant, but I was about to get it and change from cerezette (single hormone pill) to the implant when my doctor told me to have the injection instead because then this awful regular bleeding would hopefully stop. From what I know from my friends' experiences, having the implant out is quite quick (minus the waiting, have you spoken to the sexual health clinic near you? ) and the side effects go away quite quickly (although I know one who had some bleeding for a week after, probably withdrawal bleeding). But if you're not happy with the implant, definitely try the injection and DONT go on the mini pill because you're likely to have the same issues...