Is it normal to have high amounts of energy and hunger while on a medrol (methylprednisolone) dose pack?

Yes: Absolutely. The medication has a variety of effects. Other people noticed increased alertness, even possibly irritability. In addition to having anti-inflammatory properties - which it looks like is the reason you're taking the medication - one of the other things this drug clas does is mimic and stimulate the body's fight or flight response. And that is consistent with what you're noticing now.