Hormonal contraception can cause or worsen depression, I've had an awful time on the implant. It really could be worth looking into a different method of controlling your period, they really should investigate the cause of the heavy prolonged bleeding, have you been tested for anaemia too? Women with heavy prolonged periods are prone because you lose a lot of iron through bleeding. It kinda sounds like they just picked the easiest option, but you need to force them to look into it, it could just be the way you are and you have to live with it but it could be a treatable problem.
Yeah I will get it checked out my old surgery are the ones that put me on it this other surgery may not be aware of how bad it was.