Hi Ellie,
How are you doing? All of this brings back many memories of when they did a veeg on me but instead of placing the electrodes on the top of my head they drilled 7 holes in my head 4 on the RTL and 3 on the LTL and they placed the electrodes directly on my brain. Just like you I had to drink diet soda eat potato chips, and peperoni because these were the things that triggered sz. for me.
As far as using the restroom I was lucky I was able to get out of bed because I had a 25 ft. cable hooked up to me so I could walk to the restroom and get out of bed. Take my word my head was very sore for weeks from the surgeon drilling into my head.
Here's wishing you well and May God Bless You!

Sue