I think I have this or something similar. My lower back is a little soar. I am not really hungry. I have been trying to drink liquid since I have been releasing a lot of liquid ( let's just leave it at that ). I react to food poisioning differently, so I don't think it's that. I feel sleepy and have a slight headache. I think the headache is caused from lack of liquids though. Other than that, I feel fine. 