I'm new and Scared Help!

Hi all. I didn't know where else to turn so I googled and found this forum. My 2 yr old son had a minor seizure at 6 months old then yesterday had a major seizure. He was laying down napping and I could tell he wasn't feeling well then all of a sudden he started jerking horribly and his eyes rolled back and his lips turned blue. I called 911 while giving him breaths. 911 got here and by that time he was not jerking and his color was coming back. They said he had a seizure. He did have a fever when he got to the ER, however they can't be sure if it was a febral seizure or something else. He goes to his new dr to tomorrow at 9. I've been awake for 38 hours. I can't eat or sleep. All I can do it stare at him and watch him breathe. I am in a constant state of panic worrying it will happen again. I don't known how to cope with any of this. I don't know if this is the beginning of a long journey or a isolated incident. I just needed to connect with someone who may have experienced these feelings.