Please post the details of your blood glucose levels/other investigations and the current medications you are taking. Your age and a little bit of history will help too.
Need of Insulin
itself suggests that the diabetes
has progressed. The progression is usually associated with neuropathy. The headaches
could be associated with neuropathy, migraines (aggravated by diabetes, rather than insulin itself), Inadequate sleep, Mental stress or Hypertension
Consultation with your family physician regarding this problem should help.