What Causes Persistent Abdominal Pain Along With Fatigue And Muscle Soreness?

I was exposed to a URI, from which I ws feeling sinus pressure, congestion, cough and fatigue. I was treating it with OTC meds and doing pretty well. I went out to eat, and at 3am I woke with severe abdominal pain, diarrhea, nausea that would have turned into vomiting had I not taken Zofran. I was sweating and shaking. After about an hour it stopped. Now 2 days later I still have LUQ pain with rebound, fatigue and muscle soreness. Not sure I the two episodes are related, or what my next step is