I have had the implanon implant since july of 2008, and for about a year I have been having side effects. Aside from the abnormal periods, My arm and hand on my left side will go numb, I notice a lot of weakness on that side of my body, as well as leg and foot cramps. Lately I have been experiencing a lot of chest pain and heaviness, also shortness of breath, and it has caused me great concern. I get really dizzy and feel so light headed I almost faint. I am waiting to get my medical insurance back, and I am hoping nothing too horrible is happening. I don't feel very well everyday now, and I'm wondering, are these the not so good side effects of implanon, and should I have something done about it sooner??