Depo shot

I started depo in Nov. 2012 and then came off Nov. 2013 so I was on it for a year. I've been off for 16 months now. When I came off I had a period every other month then every other two months. Then I started getting a normal period every month that last about 7-9 days. Now I've been nonstop bleeding for almost a month now. And Im starting to get worried. Has anyone else had this same problem. I really need help.