If your blood sugars are running normal. and you are eating appropriately your energy should be ok. If you are not doing any exercise getting out for a 30 minute walk (or 3 -10minute if works out better) can do amazing things to boost your enrgy.

Is the decrease energy a recent change?, You may want to check with you doctor to make sure there is not an underlying other condition causing this.

Also you could to post a note on the American Diabetes Association website/chat room to see what others have tried as well.

Good luck