Cholesterol is the base for your steroid hormone cascade. Low cholesterol can lead to problems.
Low energy can be, in part, from low cortisol.
Much of what you feel is also the effect of newness and accelerating T levels. You reaction will settle down.
Be careful with your workouts. You can gain muscle strength. But connective tissue is very slow to catch up. You could tear something. Watch your form.
Hypothalamus sees estrogens and T as a feedback signal.