Help I'm really worried

So around a month ago I took plan b the day after I had unprotected sex I got my period two days early, and had it for 8 days (usually it's 5) my period was over and than today I started bleeding like an hour ago, and it's really light and I have cramps, and I've had a headache and been dizzy for like two weeks I just don't know what's going on someone help