Welcome to HCM
You have Diabetes
type II if you are allergic to sulpha drugs one group sulphonylureas may not be given to you.
As you are taking Basal Insulin (Lantus) which is long acting insulin you will be required t o take short acting insulin with major meals.
is drug from other group it may be taken but should keep blood sugar levels to desirable range.
FBS and PPBS also get a HbA1c every 3 months to monitor diabetes.
If you are obese Metformin
will be logical choice but your treating doctor is best person to decide what is best for you.
Please take care of diet and exercise.
Itching and sweating in left groin may be due to fungal infection
which is common in diabetic see a dermatologist
it can be treated easily. Keep it dry.
Good luck to you