What sickness do I have?

Ok, for the past 4 days, i have been feeling rather sick. I aways feel llike ppoing but when i try, little to no poo comes out. (the poo that comes outis not solid but not wet enough to be diahreeah). I also hae a slight stomach pain on the place where the rib cage is supposed to be. I am a little nauseous and lost my appetite which made me lost some weight. i am planning to visit the doctor tomorrow but for now, do you know what sickness i have?