What Is The Treatment For Chest Pain And Lower Left Abdominal Pain?

I have been coughing for over 4 weeks now. I already finished one course of antibiotics,, now its back with pain between my shoulder blades, chest pain and a severe pain in the lower left side of my admonin. I have been throwing up for the past 2 days and i am light headed! What is wrong? female, 29 years old, healthy