The Shot

I have been taking the shot for three years and I just recently stopped. I was due for my shot 1st of January, but decided to get off of it. I am feeling sick in the mornings, my breasts are sore, I eat for like 10 people, mood swings, depression, and also tired all the time. I am scared for what might be wrong with me? Is it normal to feel like this after getting off the shot? How long till my period comes again? and I have endometrious so is there another way to handle that pain? I am only 20 and I am scared. If anyone knows please e-mail me at soldiergrlnikki@yahoo.com. Thanks