I have always tested high for anti-insulin antibodies.
Current test:
Normal value: 0.0 - 0.4 U/mL
Value >50.0 High
It may be advisable to ask your Endocrinologist to test?
Why the Test is Performed
This test may be performed if:
Insulin no longer seems to control your diabetes
You are taking insulin to control your diabetes and your blood sugar level varies a lot, with both high and low numbers that can’t be explained by the food you are eating relative to the timing of your insulin injections