Many options. It's unlikely you're allergic to all twenty or so meds for epilepsy. There are many medication options these days. No "herbal remedy" has been shown to be particularly effective (and in a recent study, less than half of supplements even had the listed ingredient inside!) Other possibilities include VNS.
Several. There are over 20 different anti seizure drugs, so it is possible that others may be tried. However, if your seizures are not controlled, it important to find out whether you have the type of seizures that could be cured by surgery, or helped by use of a neurostimulator.