Daydreaming or Epilepsy

How do you tell? I will give you a brief history so you will understand why I have been asked to watch for signs of seizure activity by our pedi. Josh, just turned 9, has a history of electrolyte imbalances and rapid dehydration consistent with addisons disease, he passed testing and for three years struggled through chronically low BP's, nausea, dizziness, mental confusion mainly in the mornings and evenings and fatigue. He had two different stim tests done and bloods drawn every 6 weeks for over a year before we just had bloods done when unwell. Nothing showed up. Over the past year, his BP has gradually improved to a normal, consistent level, nausea is no longer daily but may still be once or twice a week with sudden onset and lasts for approx 30-60 minutes and is more severe while it occurs. Mental confusion has increased to the point that he is struggling at school over the past 6 months. The last bout of severe nausea, with dizziness, sweating was accompanied with low hr of 50. Addison's is now ruled out. While the BP was low, the mental confusion/brain fog was understandable but now??????? Our pedi asked about any seizure activity and I said that I hadn't noticed any. He has had twitches before with the electrolye imbalances but as his electrolytes were off enough to cause convulsions this was not a concern. We were told to be aware and to look for any seizure signs. I thought I would do a search and see if there was anything I was missing or other signs of seizures that I did not know or my pedi did not mention (he didn't mention any that I was not aware of) The eye blinking rang alarms, I had his eyes tested about a year ago to see if he needed glasses as he would blink and squint and his eyes checked out fine. How do you know though whether he is just day dreaming (he can get the far away look) or if it is more? He seems to respond in a delayed way although there are many times he does not remember conversations. So many of the absence type seizuzre activities are things that ALL children can do, how do you know when to be concerned? I am at the stage where I don't know if I have been seeing seizures or not, I am watching him as closely as I can between school, work and caring for my mother (during chemo) and have noticed nothing since our appt the other day...isn't that typical? :) If I notice any signs of seizures I am to go back to our pedi, in the meantime we are getting a psych assesment done to try for fundng to assist him in school. I am so confused now with what is normal age appropriate zoning out and what is possible seizure activity. Any advice you can give will be much appreciated and if you made it through this far, thank you for reading it all :)