Hey Josh B.
Welcome to the forum! :)
Sorry to hear about that seizure attack. Are you certain that you got that back pain from the seizure? Well it's actually quite common for people suffering from epilepsy to experience body pain once the seizure acts up and tenses the body.
The best thing you can do is have it checked to get a sense of certainty. Then second is have it treated. Don't solely rely on meds so consider physiotherapy, chiropractic massages, relaxation methods, aromatherapy, and yoga.
You should also treat those seizure attacks, if it is the cause of the body pain then it is essential that you treat it as well.