Non-convulsive status epilepticus can manifest with sustained or repeating complex partial seizures with a change in mental status, or simply as a focal seizure with limited physical signs but without alteration of consciousness.
yes, status epilepticus is a medical emergency, and you can treat it either by: drug of choice - diazepam, or lorazepam (given intravenously) phenytoin / fosphenytoin (given intravenously)...