Stress induced seizure

What are the symptoms of a stress induced seizure and what happens when they have them? What are risk of having so many back to back? My daughter is 27 and was admitted to the hosp. on tues. today is thurs. She cames in tues. night around 8p.m. with a Grand Mal seizure then that night she had two or three more Petit Mals., on Wed. she has had at least 3 Grand Mals and SEVERAL Petit Mal seizures and when I say several they are occuring about every 1 to 1/2 hours and they are lasting anywhere from 2 mins. to 10 mins. She was given all the test, MRI, CAT, and EEG. Nothing showed abnormal and they have her on dialantin and aderol (adderall). I just don't buy her having that much stress in her life that is would cause something so severe as this! What else could this be or what else can we do? I am very concerned that the doctors are going to send her home and not find out the real reason for these seizures. When having the seizures she is very aware that she is having them and always screams for some one to help her. She passes out just after them and sleeps for about 20min or so or until she has another. She is very scared and does not know why her body is doing this and dont understand. I was there all day yesterday and she does not remember it. This is very heartbreaking to watch when you cannot help. Please give me some facts on this type of seizure and what are the damages that can be done to her brain with having these seizures. Any detailed information please. I want to understand this.
Thanks