I Am Diabetic, And Use Insulin Before Every Meal. I

I am diabetic, and use insulin before every meal. I take blood pressure medicine also Recently my cardiologist prescribed amLOIPine Besylate 2.5mg, one tablet every morning. M y blood sugar gets lower; so I have reduced the quantity of insulin from 14 units to 13 in the morning, and from 6 to 5.5 or 5 before lunch and dinner. Today, my sugar before dinner dropped to 56, so I took one glucose tablet, and used 5 units. Is it OK?