Nexplanon side effects

So I been on this for about a year now. I always hated it. And my period would stay on for a long time. One time it was on the 3 months. So I went to my doctor and told her I didn’t like it and she told me to try it out for 6 more months. Since it was fresh in at that time (3 months) and so told me to take birth control pills on top of my nexplanon so it could make my period back normal. So year later. My  prescription is expired and I went back and she told me. To stop talking my pills because now it pointless. My period has been on for a month straight. Heavy bleeding. I always cold now. My head hurts right after I eat. And now I’m having stringy bloody discharge. I don’t know what to do. But to get off of this. But I don’t like any other form of birth control. But they all make me sick and my head hurt.