Actually, venous angiomas can cause seizures, headaches, and focal neurological deficits (though uncommon) depending on their location and size. As I have not seen your films personally or reviewed your EEG, I cannot make an accurate statement. WHat I can say is that it's not surprising that your epilepsy is refractory to medications, because you have a known anatomical problem (the angioma) that is constantly irritating the brain tissue around it, thus producing seizures.
If you are seriously considering surgical options, here at the clinic we have one of the best epilepsy surgical centers in the country. Dr. William Bingaman is our epilepsy neurosurgeon and you can make an appointment with him. Make sure to bring your films. You may also consider seeing one of our epileptologists first - we are fortunate to have many who would be happy to see you: Drs. Imad Najm, Morris, Foldvary, Nair, and Luders (our chairman) are all very good. Best of luck.