Im going to lay my post out in the same format as randy has because I think it is really clear and easy to read.
1) Tests --> If nothing shows up, it is possible that it indicates an isolated episode. As Randy has said, the activity is deep within the brain but I would expect an EEG to pick it up ~7/10 times. Just because the test says it isnt there, it doesnt mean it isnt.
2) Seasonality --> I think Randy has hit the nail on the head here... not much for me to add. As well as looking at sunlight though, also look at atmospheric pressure and temperature. I dont know what April and September are like where you are, but here in the UK they are both warm (but not hot)... somewhere around 12 degrees celcius.
3) Frequency --> Again, randy has hit the nail on the head. Its not an exact science. For some the epilepsy never goes away, for some it disappears for life and for some it reappears every now and again. The last decent neuro I spoke to would not even consider taking me off my meds until I had been seizure free for 5 years.
4) Keppra --> If your son is OK with taking it and it works, then why take the risk? As I said in the last bit, I would wait longer than 2 years. Since it is not officially Epilepsy, then maybe I would consider it after 3-4 years rather than 5, but certainly not 2.
I dont understand what it is like to have an epileptic child other than what my mum tells me. I think the main thing for you is not to panic or worry too much when it happens. The best way to combat anxiety is knowledge. If you know what is happening (I.e. what a seizure is, what is possibly causing it), what your going to do (I.e. How you physically treat your son, Using the rectal gel) and what you are looking for (I.e. How long the seizure lasts, Vital life signs etc...)
If it helps, you can write an action plan such as: Check time, Clear area of dangerous objects, Check life signs, etc...
I have done a lot of research into epilepsy, both for my own satisfaction, to help me help my mum (Who is epileptic) and also for my degree. If you have any questions, please dont be afraid to ask. If you dont know the answer, then its not a stupid question.
All the best
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