Dealing with Depo Shot Side Effects

My anxiety is kind of going through the roof right now. Last month I got the depo shot and it got rid of my period, which was amazing, but lately I've been getting small cramps and now they're getting stronger and stronger, I even started to bleed. The doctors did tell me spotting would occur within the first month or here and there, but now it's like I'm having a full-on-blown period and it's been going for more than a week. I feel very weak and I am hurting really bad I'm trying not to cry cuz I'm at work right now. it hurts the most when I start to move if I stand still in one spot it doesn't hurt too bad. But I'm in like a lot of pain. 😞 The whole point of me getting the depo was to stop my period and it's pain. Should I be worried should I go back to the doctor?