After Taking Two Extra Strength Tylenol And Four Ibuprofen For

After taking two extra strength Tylenol and four ibuprofen for several days for arthritis pain in my knee and occasionally naproxen, What effect would that have on my stomach? I have a burning sensation in the upper right side just below my left breast off slightly to the side. It dose not burn all the time, and if I drink Diet Pepsi that makes it burn some. Thank You!!!