I'm not sure how long I have been using Advil liquid gels. It has not been more than a week. I have been using it daily. Last night I had burning pain in my upper abdomen that radiated into my back. I couldn't get comfortable. I did take a dose today and have had gnawing and burning pain today in my stomach. My stomach feels raw. Eating makes this worse and having an empty stomach does as well. I am nauseated and don't want to eat. Is this something I should be concerned with?