I have had a constant pain in my lower back and abdominal area for the last 8hrs+.

You are anorexic/bulilmic, sounds like lending more towards the bulilmic side. The problem is that because of your disease you stomach shrinks and there for can only hold so much food. I'm guessing you are in the early stages since you were able to hold it down. The body wants what the body wants.

Why not seek some help for this. You really don't want your disease to get worse and the only way to stop is, is to work on this problem head on. You sound like a very intelligent person and you deserve to be healthy and not go through any pain.

Please seek help for yourself. Is there anyone you can confide in about this? A friend? a family memember? that could help you through this?

I'm having the same problem right now. i'm restricting ednos (BMI 16.1), mostly restricting though.
after a week of liquid fasting i dont know what came over me and i ordered a medium pizza AND cinnamon sticks. I ate every last bite. i don't know how i physically stuffed all that food down because my stomach must've shrunk from fasting. i could not purge after though i tried. i went to bed uncomfortably stuffed with food, wondering if it was possible to die from over-eating. ugh. now it's morning and i my lower back seems slightly swollen and hurts, and my abdomen is still distended. and i feel physically ill but my body won't throw up/ go number 2. i think my body's in shock. help ! what happened to you after ? i'm literally in the same shoes. and im in pain and kinda freaked out.

I actually just asked my question which is ironically very similar to yours- let me know how you were able to feel better- i desperately hope it's just an uncomfotable passing feeling. what scares me is my back hurting. i'm so stuffed with food that it's hurting my back and my internal organs

:(