I got the depo shot 2/4/2013. My last period was 1/27/2013 but I've taken 2 test cheapy ones I guess and both were negative (2/15/2012 & 2/18/2012 . Now I have back aches head aches stomach cramping nausea craving sweets and fruit more than ever. My breasts ache and according to my boyfriend I'm a little more weepy. Please help

Also have a 2 yr old son but I don't know if that has anything to do with it. Ive had these symptoms before my missed period