@1710dave I imagine a seizure that you didn't know was coming was quite frightening. Often finding a medication that has little to no side effects, or at least ones that you can live with, can be a challenge. Have you reported this to your physician? Hopefully he/she may suggest adjusting the dosage or perhaps prescribe another medication or strategy. In any event, changes to your medication are best done with your physician.
@kennethracey switched medications after consulting with his physician and may have some experiences to share with you.
Dave, were you doing an activity that you normally would not be doing when the seizure came on? The current health crisis has definitely increased the stress level in most folks throughout the world and stress can trigger many things. Have you experienced a radical change in your lifestyle since the CoVID virus came ashore?