I am a type 2 and never experienced sudden drops (or even hypoglycemia) until a few weeks ago. Now my blood sugars seem to be all over the place. This afternoon, my bg level dropped by 100 in just 90 minutes. I think it's due to medications I am taking, but am not sure because it happens at different times and I've not been able to identify a pattern. It greatly concerns me and I will continue to work with my endocrinologist to figure it out.