Is it possible to have "sympathetic" seizures?

So, about a month or two ago, i found out that my best friends little sister (who is like my little sister), has seizures and has something along the lines of epilepsy. Ever since i found that out, things that dont normally happen to me, keep happening. In May of this year i went to a concert with some friends, and i didnt even get to see the person that i actually really wanted to see because i passed out and my friend had to carry me outside. And fyi, i have NEVER passed out before in my life. Then, about a week or two ago, my friend offered me this spice and salvia mix, and i thought, why not smoke it? so i did, next thing i knew i couldnt see very well, my heart was racing, and there were black dots everywhere in my vision, and i kind of had tunnel vision. I thought i had passed out, but when i asked my friends about it they said i was convulsing and my eyes were rolling back in my head, as if i were having a seizure. So this really scared me and i have no clue what to do about it, or what is even happening to me. I would really like to figure this out though, so i dont put myself in a potentially harmful situation. So, if anyone has an idea of what could be going on, or any advice for what i should do, PLEASE let me know.