Symptoms of complications (a) Numbness, tingling, burning pain or swelling in your feets/hands. This could be a sign of diabetic neuropathy. (b) Blurry or spotty visions or seeing flashes. This may be a sign of diabetic retinopathy. (c) Cuts or sores that wont heal or that look infected. (d) Chest pain or shortness of breath. This may be sign of heart disease or blood vessels problems. (e) Frequent bloating, belching, constipation, nausea & vomiting, diarrhea or belly pain after you eat.