Severe pain after no depo use

Patient: I have been on depo on and off since my son was born and he is now 5. I am going through a divorce and decided to stop the shot and try to get my body normal again because the whole time I have not had any periods. My last shot was is January of 2011 and in the past week in a half I have been getting major headaches everyday from the time I open my eyes and I take bc powder for it. Now yesterday I started spotting very dark almost black like blood and having pain in my lower left quadrant of my abdomen and nausea. I wonder if it’s just my hormones getting back on track but I am a little worried from seeing the side effects. I havent been able to sleep much either and have sweat flashes and I’m only 25. Please anyone with answers help.