Since how long are you on Insulin?
Since when do you have loss of metabolic control?
HbA1c test will give you a reasonable idea of your level of control over the last 4 months
Get a HbA1c test done
You also need to consider other triggers which could be derailing your control
Undetected infections or
Thyroid disease could be responsible
Get a
TSH ,Urine CUE and a Cxray done
Next Steps
Consult a Physician .He could suggest you other options including newer Oral drugs