Could you, or could you not?

Okay, please no rude answers or comments. I'm a wreck here. I took the depo once after I had my daughter. 6 months ago. But I didn't go in for another shot at the three month mark. Now I'm up the wall. Moody. Urinate often. Headaches. Sleepy all the time and just so emotional!!! I actually almost cried after that scene in breaking dawn part two! I never cry during any movie at all. I was wondering is this the after effects of getting off the depo after only one shot??? Anyone experience same or similar things???