it is a pretty big change to get diagnosed with type 1.
How are your blood sugar control going?
The lack of energy may come as your body is getting used to being regulated. Excellent blood sugar control will help your energy levels return to normal.
Also would recommend you get your thyroid checked as it is quite common to have both thyroid issues and diabetes.
If your glucose numbers aren't consistent then you will feel tired and no energy because the high to low and low to high makes your body feel that way
I know it's hard but trying to keep your numbers consistent will alleviate this
People with diabetes will also have problems with sexual intercourse talk with your doctor about this