Suggest Treatment For Chronic Constipation

I haven't been to the bathroom in almost two weeks now, and I'm starting to get pains in my abdomen. I've taken two enemas, half a bottle of Milk of Magnesia, and a stool softener, along with drinking almost half a gallon of apple juice, in order to try to go. Nothing is working, and I'm hurting, and I don't know what to do. Is there anything I can do at home that is more likely to work than what I have tried, or will I need to go to the Emergency Room? This isn't a normal thing, for me to have trouble going, I usually go twice or more a day, so I don't know what is wrong.