I been taking ibeproufin for pain lately & ever since then i been feeling sick in my upper stomach, chills, & pooping nausea?

May be a side effect: Ibuprofen - and all medications in its family - can cause gastrointestinal irritation, upset stomach, nausea, even bleeding or ulcer! bleeding from the GI tract may appear as black, tarry stools - or look like coffee grounds when you vomit. Isn't that interesting? Clearly, get in touch with your doctor urgently if these things happen. A switch to tylenol (acetaminophen) could help, but check in with your doctor.