After being seizure free on low levels of dilantin for 15 years after just 2 what is the odds a seizure will return. everyone tells me 100 percent?

Hard to predict: The correct odds are 50/50. If your Dilantin levels have been sub-therapeutic, and you have been totally sz-free, the odds are in your favor. Since your last event was at age 15, this is also positive. To help assess this, check with a board certified neurologist with epilepsy experience, get an updated eeg. If appropriate, can slowly taper off, but under close obs by your neurologist.

Seizure activity: An eeg would tell you if there is any active seizure spike or focus.