My dog is having siezures...

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She is almost 4 years old, and a Lab-Springer Spaniel mix. She has never has any health problems in the past, and her brother (from the same litter) isn't having siezures himself. This just started 1 1/2 weeks ago, when she had two siezures in one day, 5 hours apart. My husband took her to the vet and she was prescribed phenobarbitol. We gave the medication for a few days, and my husband decided to stop giving her the medicine - he read is leads to liver problems with prolonged use. We switched the brand of dog food we use to an organic/all-natural type and have been closely monitoring when she tries to eat outside - which is nothing she hasn't already been eating for the past 3 1/2 years. She was doing fine until last night around 2 am and she woke us up in bed siezing. We gave her another pill and have kept an eye on her all day. My question is: When we take her in tomorrow to insist on blood work and/or testing, is there anything specific we should try to rule out? Is there anything else we can do at home to try to get the seizures under control?