i had this fear awhile back. the initial fear only lasted about 2 weeks. i was very scared of having a seizure or something. from time to time, i get worried that i will have a stroke. you're not alone in your worrying!
I know the feeling but you have to know that it will not happen anxiety nor panic will cause you to have a seizure or stroke....you would have to already have something else going on to cause either of these