Sick for 2 weeks

For two/three weeks now I have been nonstop sick. I first had a bad sinus infection and it went away but I kept a cough and my nose is still stuffy. Well for 2 weeks now every time I eat within 15 minutes I’m pooping, was diarrhea now just semi regular bowel movements. I’ve lost 5-7 pounds and have 0 appetite. I could be starving and I have to force myself to eat. I get nauseous to the point of gagging right after i eat. I ate a peanut butter and jelly sandwich and was gagging.. I was thinking maybe appendicitis? I’m 20 years old and not sexually active. Not being hungry and eating is causing me to get dizzy and shakes. I’m going to the doctor this week but wanted to see if anyone had similar symptoms?