A fasting blood sugar of 422 mg/dL and post-meal sugar around 400 mg/dL are very high and may indicate poorly controlled Type 2 Diabetes. You should consult a doctor, as your medicines or insulin doses may need adjustment. In the meantime, follow a strict diabetic diet, avoid sugary and refined foods, stay well hydrated, and monitor your blood sugar regularly. Early medical attention is important to prevent serious complications.