The one in your arm is Implanon I'm assuming. That lasts 3 years...not 5. I had it for about a year and a half and had them remove it. I bled pretty muvh constantly and had the sore breasts too. They said that those side effects can disappear after awhile but mine didnt until I had it taken out.
Yes, implants last up to 5 years. It just the hormones affecting your body.