Therefore, I believe you should be evaluated for adult onset type 1
diabetes. This would involve evaluation of c-peptide, antibodies, and insulin
levels correlated with blood sugar levels. Type 1 is lack of insulin (and needs injected insulin), Type 2 is plenty of insulin, but there is insulin resistance and the insulin is not effective. For Type 2, oral meds may be appropriate.
If it is adult onset type 1, it may develop quickly.