In response to a request for an overview of differentiating seizure and syncope, I found the following nice review from Lancet Neurology, 5(2) 171-180.
Seizure versus Syncope
There are many articles available. One place to start a search is to enter (seizures[mesh] syncope[mesh] differential diagnosis[mesh]) into PubMed. You can broaden the search by removing the ddx portion.