Hi and welcome. The hypo indicates too much Gliclazide or insulin. I asked my DN who put me onto insulin to stop the Gliclazide as there is no point in taking both; she agreed. Do discuss this with the DN. Do let us know what insulin regime you are on i.e. Mixed or Basal/Bolus. If you are not overweight then as others have said you could be T1.5 (Late onset T1) in which case insulin is almost certainly the right medication in the long-term. If you come off Gliclazide then your insulin dose may need to be adjusted as well as matched to your diet