| Sudden blood sugar increases in me happen for the following reasons:
1. Bad insulin (have you been storing it outside of the refrigerator, has it been exposed to high temps in your purse, and how long has it been open?)
2. Hormones -just before your period you can get some serious insulin resistance, causing you to require a LOT more insulin than normal. It usually resolves once your period starts.
3. Steroid injections -steroid injections or pills for dental surgery, shoulder pain, allergies, whatever, can wreak havoc on your blood sugar, making you horribly insulin resistant, but it resolves once the steroid is out of your system.
Try opening a new bottle of insulin first, and see if that makes a difference. Bad insulin acts like water.... just totally ineffective. | 
