The best way to diagnose seizures, hands down, is the EEG. Even that can be hard, because of the timing. An epileptic seizure (what most people just call seizures) comes in multiple forms, but what tells the neurologist it's a seizure? Electrical brain activity. EEG reads electrical brain activity.
So, I understand why the receptionist was short - though it sounds like she assumed you knew more than you do.
Blood tests can identify certain types of seizures, but not all of them, and that info along with what others observe of the activity will create a clearer picture for the neurologists.
PNES are non-electrical. So, if you want to know for sure that you don't have a seizure disorder - you need to get properly diagnosed.
If you drive a car? Operate machinery? Then you really need to get diagnosed. You may not care about yourself getting hurt, but you should remember that you could kill someone.
To be honest - you don't know what happened to you, because you can't self-diagnose a seizure disorder.
PNES are a really interesting phenomenon, but they are essentially a panic attack. They are managed with aggressive interventions for anxiety, serious training in how to manage your own anxiety. And like full panic attacks - they are terrifying, and people experiencing them often believe they are dying.
I'm glad you're having the inpatient EEG, and encourage you to let the doctor do the diagnosing.