My mom is diabetic from past 5 years. Her diabetes level has always been under control with medicine though. The three months diabetes test HbA1c always showed very good control (6.5 - 6.8%) however, from past one month the blood sugar level is very high. Daily value fluctuates between 180-400. HbA1c report was 7.4%. She is also experiencing breathing problem and pain in the left arm. What could be the reason for the increase in blood sugar levels ? What all tests could be done to diagnose the root cause of the problem ?