Hi,
Welcome to HCM,
You are diabetic on combination of Oral drugs and Insulin,causes for
weight loss and weakness may be many, so please visit your Physician /
Endocrinologist.
To enumerate possibilities development of Nephropathy causes
low blood sugar level with same diet and insulin,Anemia,any cardiac ailment,or even low grade infection or malignancy.
We need to examine and depending on that appropriate investigations like Renal function test, Urine R&M test for albumin in urine and blood Urea and
Creatinine,Complete Haemogram,EKG,X ray Chest,
Abdominal Ultrasonography may help to point out cause.
Your age peri menopausal so hormone changes and resultant blood loss may cause Anemia.
Once we know the cause treatment can be planned and you can regain good heath again.
Please get medical check up and investigations as soon as possible.
Take care
Best of Luck