With a number of patients diabetes medication taken on an
empty stomach may cause
stomach discomfort. Have you spoken with your doctor about this? It could be unrelated to diabetes yet related to an ulcer, an intestinal tract infection, gall bladder stone, pancreas issues, etc.
As far as cinnamon helping to lower glucose levels, the answer is no. Returns from the past 5-7 years of various studies/research and clinical trials concluded cinnamon does not lower glucose levels.