I'm happy to hear that you have found a cure for your seizures but I also understand your fear of their returning. Once you've had a serious health problem, it is hard not to worry that it will return. Those of us who have had cancer treatment face that same fear on a regular basis.
You said in your post, "but I figured that it is probably similar to PTSD," that certainly might be true. Have you considered talking with a trained counselor regarding these fears? It may be a good option for you. You articulate your feelings quite well and that is a good basis for counseling.