@mommacandy
I believe it is essential you discuss your epilepsy with a Neurologist, Oncologist, and your primary physician may be have some helpful advice. Be completely open and honest. Tell them everything from the first seizure to the last.
I don't know much about cancer treatments being related to epilepsy other than radiation directly applied to the brain which can cause seizures soon after exposure or many years after exposure in some people.
I would have concerns about the possibility of body chemistry like low sodium, blood sugar levels, etc which may trigger seizures. Definitely talk to your doctors to try and get them controlled. There are seizures that are extremely dangerous.
1. Status Epilepticus, seizures that don't stop on their own.
2. S.U.D.E.P. Sudden Unexpected Death in Epilepsy, although these conditions aren't common they may end in death. So it's important to do as much as your comfortable in doing to control your seizure disorder.
Do you primarily have nocturnal seizures?
Take care,
Jake