
The last possibility that I have heard about from other
type 2 diabetics is that sometimes if
glucose levels have been left untreated and high for a long time, the person can feel pretty crummy for the first few weeks after starting medicines to lower the glucose levels, for the body has gotten used to the elevated glucose levels as being the "norm." It can take some time for you to feel OK as your body adjusts to new glucose levels as being normal again.