Petit mal is an older term. What's your current diagnosis? Also, absence seizures is a symptom, not a diagnosis - asbense seizures occur in many different types of epilepsy.
The real question is, how disabled are you? Do you drive? Do you take medication, and does the medication work? Are you at risk of blacking out at random times - how many injuries do you have? Do you know in advance that you're going to have a seizure or do you "wake up" and realize that you had one? How often do you seize?
Are you on any type of disability payments or supplementary insurance? Are all your friends and co-workers aware of it? Do you have to think about how your system will react before doing anything?
My take is that if you can ask the question, you don't need to put it down as a disability.
The real answer, however, is to ask your doctor. If you don't need to work with a doctor or medical specialist on a regular basis, then the answer is no.