Final answer:
If a 19-year-old male with diabetes is feeling unwell and unable to remember if he took insulin, it is important to assess his blood glucose level. If the glucometer shows an error, it is best to contact medical control and administer oral glucose while closely monitoring the patient.
Step-by-step explanation:
If a 19-year-old male complains of "not feeling right" and cannot remember if he took his insulin or ate, it is important to assess his blood glucose level. However, if the glucometer reads "error" after several attempts, it may indicate a significant issue with his blood sugar. In this case, it is best to contact medical control and administer oral glucose to help raise his blood sugar level. This should be done while closely monitoring the patient and requesting a paramedic ambulance for further assistance if needed.