My DS2 was diagnosed with Absence Epilepsy when he was 5.5 years old.
It is scary but our Neurologist assures us that of all the types of seizures to have, the absence ones are the "best". There is also a very good likelihood that kids with Absence Epilepsy will grow out of it by their mid-teens.
We are in Australia so the diagnosis path may differ from yours. It's been nearly two years since he was initially diagnosed - he has had three EEG's to confirm the seizures, an MRI to look for injury/tumour and is now medicated with an anti-convulsant medication. He has needed a fair number of blood tests to ensure that the medication is agreeing with him and in the last couple of weeks had a huge round of blood tests to ensure that there were no underlying metabolic issues. We still see at least one seizure a day - typically when he is concentrating or reading aloud. They last around 5 seconds.
I totally understand how scared you are - it's frightening to think that your child may have a life long condition. I am still coming to terms with this and I've known for two years. My son had a particularly bad episode last night and it's left me feeling anxious and worried for him.
Keep your DD well hydrated, well rested and avoid too much processed/salty food. Try to be pragmatic as the diagnosis might take some time - typically the EEG is done by a medical technician, then sent to the Paed Neurologist for review. Even in the private system here this took more than a week.
I don't have much more advice, just wanted to say I know how you feel and if you need to talk, I am happy to listen.