What Was The Episode Of Convulsions And Stiffness In Body After Having Sex?

After sex the other day, my partner told me I went limp and started convulsing. I am mostly unaware of the event. My muscles locked up and I was temporarily paralyzed. I had trouble opening my eyes and had blurry vision. When I was not convulsing, I was shaking. This lasted about an hour. Could this have been a seizure?