Please tell your wife she has nothing to fear or worse be ashamed about . I suffer from Epilepsy and have been living with it for the last 26 years .My grandmother suffered,I have two sisters and a nephew who also suffer.We are all,as the guest above so rightly says,sane (most of the time!),intelligent and productive people who occasionally fall over . The condition is more greatly understood these days and can be well controlled ,so please pass on our reassurances.
It is not,as some people think,a mental illness.I also know from experience that excess alcohol can bring on a fit.
The best advice I can offer is be there for her if she has a convulsive attack,keep her out of the way of anything with which she could injure herself and comfort her when she comes round.The worst thing about the aftermath of an epileptic fit is the person who suffers it has no idea what has gone on, other than the panic on the surrounding people's faces. Believe me , it's more scary for the people who are around you than for you youself.
It may take time for the condition to become controlled but once the medication is suited to the patient there is no reason why your wife cannot live the same kind of life as she did before the diagnosis.
I hope this reassures both of you.Good luck and I hope it all works out well.