Can low Potassium, Phosphorus result in a seizure?

I was diagnosed with simple partials about a year ago (when I was 29 years old)  originating in left temporal lobe, and put on 900 mg/day of Trileptal. I also have had infrequent bouts of heart arrythmia (usually atrial fibrillation) that is currently untreated (at my cardiologists discretion). About a week ago, I began to feel extremelly faint, sweaty, and had a ringing in my years. Next thing I know i'm on the ground, feeling terrible with a pounding headache. EMT's arrive, run an EKG, and reveal no heart rythm issues. At the hospital, blood tests reveal low potassium levels of 2.9 mEq/L (normal is 3.5 - 5.0) and phosphorous of 1.7 (normal is 2.5 - 4.5). They loaded me up on potassium and phosphorous and discharged me. So, question #1 is, can low potassium and phosphorous trigger a seizure? I'm suspicious I had a full tonic-clonic seizure, but unfortunately no one saw it to confirm.  Since then, I've been having frequent simple partials, and my nero has increased the trileptal to 1,200 mg/day. It's only been 4 days since the increase - but there has been no decrease. How long should the dose increase take to have an effect?