Hi Sandquad,
Low energy is probably the most common side-effect of ADT. I was on ADT for 2.5 years and I've now been off ADT for 13 months and I would say my energy is only about half what it used to be 4 years ago.
That being said, intense exercise cannot be recommended enough. The days where I feel almost normal are those when I've pushed myself harder than in my previous training session. For example, if I jog for one minute more than the previous day, I somehow feel less tired. Same if I do 25 reps instead of 20. Of if I add 5-10lbs more to a weight machine than previously.
If I do not train, I get more and more tired.
If I train normally, as in a routine, I am less tired than when I do not train
But if I surpass my typical routine, then I can last my day without requiring a nap.
Best of luck to you.