Hi I am Dr.Shreyash Mehta, MD Community Medicine I understood you query, I hope my answer shall solve your query. As you told that you are a diabetic and your blood sugar has been above 300 mg/dl. This is termed as hyperglycaemia. If hyperglycemia persists for several hours and leads to dehydration, other symptoms may develop, such as: Difficulty breathing Dizziness upon standing Rapid weight loss Increased drowsiness and confusion Unconsciousness or coma Left untreated, hyperglycemia can lead to a condition called ketoacidosis, also known as diabetic ketoacidosis (DKA) or diabetic coma. This occurs because the body has insufficient insulin to process glucose into fuel, so the body breaks down fats to use for energy. When the body breaks down fat, ketones are produced as by-products. Some ketones are eliminated via the urine, but not all. Until the patient is rehydrated, and adequate insulin action is restored, ketones remain in the blood. Ketones in the blood cause nausea, headache, fatigue, or vomiting. As you told that you have asthma and neuropathy also, I advise you to consult a physician immediately so your blood sugar levels will be restored and you altered metabolism is corrected.