Could my seizure have been provoked?

Hi doctor,

I had my first tonic clonic (grand mal) seizure seven days ago at work. It lasted 1 minute 30 seconds. I bit my tongue badly, but did not have any incontinence. Beforehand, I was shaking, had a loud beating heart and had a feeling of vertigo and anxiety. Afterwards, I was confused for approximately 15 minutes. I was being very active at the time and was bending down and rising several times to tidy up a room, which may have contributed to feeling faint or having a head rush. I am a 27 year old obese woman. My height is 5'6" and weight is 266 lbs withuntreated bulimia that comes and goes in phases since the age of 15. For the previous three months, I alternated between low carbohydrate days, the days I accept as good days and bad days where I may binge and purge up to three times a day. I vomited 12 hours before my seizure and did not eat or drink anything after that. I had 5 hours of sleep and then drove an hour to work. After my seizure, my employer, who happens to be a doctor, gave me lots of water and tea and sent me to a general physician (GP). An hour later, I had a blood test and the results came back all normal, but borderline low potassium. My electrocardiogram (ECG) scan is normal and nothing wrong with reflexes or balance. I do not have diabetes. I have also seen a neurologist, who has put the seizure down as isolated and unprovoked. I have not told my GP or my neurologist about my bulimia. My magnetic resonance imaging (MRI) and electroencephalogram (EEG) scans are pending, but my neurologist said that they will probably come back clear. I have never felt my aura before as any indication of epilepsy, minor seizures or myoclonic jerks. I have also scared of my bulimia now, which is a positive. I realize that I am probably clutching at straws or in denial that I may have adult onset epilepsy. My question is that could my seizure have been provoked? Thanks in advance.