Depends on the cause of the seizures. There are so many reasons, nervous system, endocrine, hormonal, electrical "storms" in the brain, arterial entrapment or other vascular causes, and idiopathic.
You should check with your physician to see if there are any contraindications for pressure or range of motion activities in the neck, and if there are any reasons not to have circulatory massage.
Your massage therapist should ask these questions. If you tell a therapist that you have been recently diagnosed with seizures, and they just dismiss that, find another therapist. Your therapist should be most concerned with your well-being and with this diagnosis should want to get a physician's okay first.