As a registered nurse, I recommend you look into alternative therapies but be very careful. I am not aware of any scientifically proven treatment for tonic-clonic seizures that does not involve medication.
It is also important to have blood levels of your anti-seizure medications checked to make sure they are at a therapeutic level. Make sure you tell your doctor about any other medications you are taking in case there might be an interaction.
I also suggest you look into getting a seizure response dog. These dogs are trained to respond to seizures by doing whatever it is the client wants the dog to do, for example, go get VNS magnet, meds, phone, another person, or just stay with the person. After living with the person with seizures for a while they start to sense them coming on and may alert you prior to the seizures; having a dog also tends to result in a decreased number of seizures, probably because the client feels safer and more comfortable having the dog around. Contact Paws With a Cause: www.pawswithacause.org if interested to get an application.
Check out the VNS magnet - I have seen this used in severe seizures and it helped. Also check out this implanted EEG device: http://neurogadget.com/2011/12/06/implanted-eeg-de... I would recommend you get a second opinion on management of your seizures from a board-certified neurologist.