Enlarged pupils, yawning, tearing, sweating, increased sensitivity
, odor & sound, sensitivity to being touched (i.e. 'the creeps'), stomach cramps, shivering/chills, low energy, sleeplessness, Restless Leg Syndrome, nausea, vomiting, an inability to lie still at night, diarrhea, and sometimes occasional faintness & sensations of tightness in the chest. Some people experience panic attacks.
As to how long it takes to regain energy, it really varies from person to person.