Could Combination Of Cholesterol And BP Medications Cause Upset Stomach?

HELLO,I'M TAKING A FEW PILLSA DAY WHICH INCLUDES, SIMVASTAIN 20MG FOR COLESTEROLE,MELOXICAN 7.5 MG IM NOT SURE FOR WHAT, AND TRIAMT/HCTZ37.5-25MG FOR BLOOD PRESSURE,AND VITIAM B-6, IS IT POSSIBLE THAT THIS COMBO OF PILLS IS MAKING MY STOMACH UPSET, AND YES I DO EAT BEFORE I TAKE THEM