Diet, Drugs, sleep... What is known to increase/decrease seizure activity?

Hi there, I'm fairly new to this site, so you may have talked this issue to death already.  If so, please point me to the conversation.

I've been living with "episodes" for over 20 years that last about 5-10 seconds where I cannot process speech (written, spoken, sung).  I am aware of this and can continue to walk, chew gum, play drums, drive etc.  I have had 3 gran mal seizures during those 20+ years.  I'm currently on Carbitrol - 1200 mg/day.

Anyway, I've been trying to correlate an increase in episode activity with my diet, sleep cycles, etc. and cannot find any rhyme or reason for the periods of increase.  I can go months without any activity, then go several days where they happen 10 times per day.

I gave up Diet Coke for a year and it made no measurable difference.  I've almost thought I could correlate pizza with increased activity, but don't have enough data to back this up.  I once thought broccoli triggered it too, but have since rejected this.  During times of little sleep, I often do better than times where I get a lot of sleep.  Like I said, no rhyme or reason.  I've considered writing a detailed journal to be more scientific about this, but I'm way to busy for this...

I noticed on another thread that antihistimines can trigger seizure activity.  I took a Claritin the day before yesterday and yesterday was really bad.  Today I seem to be back to "normal" with no activity.  I hardly ever take any drugs other than the Carbitrol, so this is only a side note.

Have any of you found a correlation between diet/exercise/sleep/whatever and increased/decreased seizure activity?  I'd love to get some ideas for things to try.

Thanks,

Doug