11 years ago(when I was 8 years old) I had an unprovoked seizure. I have been off meds for almost 10 years now. I never had another seizure. Since that night all EEG’s I had done have detected 0 seizure activity and I had an MRI done that showed nothing wrong with my brain. Is it possible for me to get my 1st class medical or special issuance?
Nobody can say without knowing your full medical history, but it is possible if this is your only medical issue.
The FAA's guidance to AMEs on seizures can be found here. From what you've said, you would fit into row B or C (it doesn't really matter which, since they want the same information either way). The documents the FAA will want to see are listed in that document. Make sure you have all of them, and at the correct time periods before your AME exam is scheduled.
Seizures are also mentioned in this Federal Air Surgeon's Medical Bulletin. It mentions that they have a 3rd class medical certificate to an airman with a history of six seizures, so a single seizure is definitely not a deal-breaker.
You are very likely to be deferred, and to may need to undergo additional monitoring for a period of time. But if all the required tests look good you should be able to get a special issuance.