Listen to your body. That has never failed me.
Skating takes it out of you, worse then swimming. It's weight lifting, balance, stamina, and coordination. It's a complete workout.
Eating well (fruits and vegetables, lean proteins, and less fatty meats) is very important. I've gone almost vegan these past two weeks, and feel the greatest I have in a long time.
If you still feel tired, consider seeing a doctor. Could be thyroid or other imbalance. Listen to your body.